Census Blocks of Loudoun County, VA (2020)

Loudoun County, VA, Department of Management and Financial Services 19Jan12 Census Blocks of Loudoun County, VA (2020) vector digital data Leesburg, VA Loudoun County, VA GISDBB.GISBROW.CENSUS2010_BLOCKS_POLY withheld This GIS layer contains the geographical boundaries of the 2020 census blocks for Loudoun County, Virginia. The 2020 Census block boundaries were used for statistical data collection and tabulation purposes for the 2020 Decennial Census. Census blocks are the smallest geographic area for publishing data from the decennial Census. The geographical area covered by this geographic feature class is generally very small in densely settled areas, for instance one city block. In sparsely settled areas they may cover several square miles. Census blocks nest within every 2020 Census geographic area (i.e. block groups, tracts, census designated places, and local, state, and federal election districts). This nesting of blocks allows Census Bureau statistical data to be tabulated to the appropriate geographic areas by aggregating the block data up. Census blocks are uniquely numbered within census tracts, with the blocks valid range being 1 to 9999 with leading zeros added (i.e. 0001, 0023) when necessary to create a four digit unique identifier. This 2010 Census block layer is based on the U.S. Census Bureau Census 2020 TIGER/Line files. The boundaries are an extract of aerial photography and cartographic information, such as roads and streams, from the Loudoun County GIS system. Census Blocks are bounded on all sides by visible features, such as roads, streams, lakes, power lines, and railroad tracks, and/or by non-visible boundaries such as town and county boundaries, and short line-of-sight extensions of streets and roads. Census blocks are used in demographic analyses of Loudoun County. They are also used during the redistricting process to define local, state, and federal election boundaries. Blocks give the most detailed picture of the demographics within a given area. The 2010 Census block layer has been modified from the Census Bureau's Tiger line file. Users should be aware that the Census's Tiger line data is devised from a mix of national and local GIS data sets. When the Tiger line data is overlaid with Loudoun County Government's detailed GIS layers it can be determined that the Census Bureau's Tiger line boundaries in some cases are slightly off from the actual location of the physical features, natural features, and governmental units such as town boundaries that they are designated to follow. The 2010 Loudoun Census block layer was generated by Loudoun County so that the block boundaries would overlay with the features in Loudoun County's GIS data sets that the boundary are designated to follow. Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN (vertical datum, if applicable, NAVD88), US Survey foot units. en 19Jan12 unknown publication date Complete None planned before 2020 Census -77.963439 -77.323973 39.326230 38.844263 11635727.443366 11815632.016717 6992630.694961 7166506.778835 none Virginia Loudoun County 51107 boundary, census, boundaries, demographic, blocks none Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data. Loudoun County, VA, Department of Management and Financial Services mailing and physical address

803 Sycolin Rd, Suite 104

MS 61

Leesburg VA 20175 USA 703-777-0563 8:30-5:00 EST, M-F Demographer Public Information ESRI ArcCatalog 9.3.1.4000 Feature Class Retention of attribute accuracy throughout the personal geodatabase or shapefile to ArcSDE geodatabase feature class coversion process was ensured by a manual or automatic QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution. Topologically clean Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data. Retention of coordinate accuracy throughout the personal geodatabase or shapefile to ArcSDE geodatabase feature class conversion process was ensured by a manual or automatic QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter, and length differential of less than +/- 0.5%. U.S. Census Bureau Feb 2011 vector digital data U.S. Census Bureau, 2010 Decennial Census summary file Demographic data source for population, housing units, and households for census tracts online Census block shapefile downloaded from the U.S. Census Bureau. Overlaid the Census Bureau shapefile with with Loudoun County Government's detailed GIS layers to determine the actual location of the physical features, natural features, and governmental units such as town boundaries that the census blocks are designated to follow. Digitized lines using Loudoun County Government's detailed GIS layers. 2011 Loudoun County, VA Office of Mapping and Geographic Information (OMAGI) Land Records Staff U.S. Census Bureau October 2010 U.S. Census Bureau TIGER/Line files online Provided the foundation upon which census blocks were drawn. The 2010 Census blocks were the basis for devising the census tract boundaries. Loudoun County Vector Simple FALSE 5882 TRUE FALSE coordinate pair 0.000256 0.000256 survey feet D_North_American_1983_HARN Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983_HARN NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet Not Applicable 1.000000 Not Applicable Explicit elevation coordinate included with horizontal coordinates CENSUS2020_BLOCKS_POLY polygon feature class ESRI Feature Class 5882 OBJECTID OBJECTID OID 4 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Shape Geometry 0 0 0 Feature geometry. ESRI Coordinates defining the features. BL_FIPSSTCO BL_FIPSSTCO String 5 0 0 Federal Information Processing State and County Code Loudoun County It is a five digit code that identifies the state and county of the census block. The first two digits designate the state and are the state FIPS code. The last three digits designate the county and are the County FIPS code BL_TRACT2020 BL_TRACT2020 String 6 0 0 Identifies the census tract that the block is within. Loudoun County BL_BLOCKGROUP2020 BL_BLOCKGROUP2020 String 1 0 0 One digit number that identifies the census block group within a census tract Loudoun County BL_BLOCK2020 BL_BLOCK2020 String 4 0 0 Four digit number that identifies the census block within a census tract Loudoun County BL_GEOID2020 BL_GEOID2020 String 19 0 0 The federal information process codes Loudoun County BL_POP2020 BL_POP2020 Integer 4 0 0 population of the block Loudoun County BL_HHPOP2020 BL_HHPOP2020 Integer 4 0 0 Total population minus group quarters population Loudoun County BL_GQPOP2020 BL_GQPOP2020 Integer 4 0 0 Total population in group quarters Loudoun County BL_HUNITS2020 BL_HUNITS2020 Integer 4 0 0 housing unit count for the block Loudoun County BL_HHLDS2020 BL_HHLDS2020 Integer 4 0 0 households of the block. Households are occupied housing units Loudoun County BL_UPD_DATE BL_UPD_DATE Date 8 0 0 Date feature class created or modified Loudoun County Date value that is automatically generated BL_UPD_USER BL_UPD_USER SmallInteger 2 0 0 Not for public distribution. Internal User ID of editor creating or modifying feature class. Loudoun County Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. BL_FIPSSTCO: Federal Information Processing State and County Code 51107 - Virginia (51) and Loudoun County (107) Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI) Public Information Counter mailing and physical address

1 Harrison Street S.E., 2nd floor

MS 65

Leesburg VA 20175 USA (703)771-5778 (703)771-5075 mapping@loudoun.gov 8:00-4:30 EST, M-F Offline Data Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. GDB ESRI Personal Geodatabase Feature Class DVD SHP ESRI Shapefile DVD DXF AutoCad Digital Exchange File DVD Loudoun County distributes spatial data in ArcGIS database or shapefile & DXF format for the cost of reproduction. Countywide spatial datasets may be purchased for $22 per DVD for up to 4.5 GB of data. There is a $100 surcharge to purchase countywide topography, and a $3 charge if the item is to be mailed. If the customer wants the data in DXF format and/or would like OMAGI to custom select specific geographic areas of the County, there is an additional $7 per 15 minute increment labor charge. Select aerial imagery is also available. Size limit: 4.5 GB. Visit our website at: http://www.loudoun.gov/omagi, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests. 20120125 mailing and physical address

1 Harrison Street SE, 2nd Floor

Leesburg VA 20175 USA

MS 65

(703)771-5778 (703)771-5075 mapping@loudoun.gov 8:00-4:30 EST, M-F Loudoun County, VA, OMAGI Metadata Specialist FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF products. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata. en 20210816 13480600 20210819 12325000 FALSE 20210816 13480600 CENSUS2020_BLOCKS_POLY 002 11635727.561894 11815629.718605 6992632.821297 7166492.436947 1 Projected GCS_North_American_1983_HARN Linear Unit: Foot_US (0.304801) NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",11482916.66666666],PARAMETER["False_Northing",6561666.666666666],PARAMETER["Central_Meridian",-78.5],PARAMETER["Standard_Parallel_1",38.03333333333333],PARAMETER["Standard_Parallel_2",39.2],PARAMETER["Latitude_Of_Origin",37.66666666666666],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2924]]</WKT><XOrigin>-110512499.99992953</XOrigin><YOrigin>-88857999.999874651</YOrigin><XYScale>3906.2499963620194</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0005120000004768374</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2924</WKID><LatestWKID>2924</LatestWKID></ProjectedCoordinateSystem> FGDC 1.0 150000000 5000 FGDC CSDGM Metadata 20210816 Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362 Census Blocks of Loudoun County, VA (2020) vector digital data 2012-01-19T00:00:00 Loudoun County, VA, Department of Management and Financial Services Demographer 11635727.443366 11815632.016717 7166506.778835 6992630.694961 1 -77.963439 -77.323973 39.32623 38.844263 1 1 -77.963438 -77.323982 39.326190 38.844269 Census blocks are used in demographic analyses of Loudoun County. They are also used during the redistricting process to define local, state, and federal election boundaries. Blocks give the most detailed picture of the demographics within a given area. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This GIS layer contains the geographical boundaries of the 2020 census blocks for Loudoun County, Virginia. The 2020 Census block boundaries were used for statistical data collection and tabulation purposes for the 2020 Decennial Census. Census blocks are the smallest geographic area for publishing data from the decennial Census. The geographical area covered by this geographic feature class is generally very small in densely settled areas, for instance one city block. In sparsely settled areas they may cover several square miles. Census blocks nest within every 2020 Census geographic area (i.e. block groups, tracts, census designated places, and local, state, and federal election districts). This nesting of blocks allows Census Bureau statistical data to be tabulated to the appropriate geographic areas by aggregating the block data up. Census blocks are uniquely numbered within census tracts, with the blocks valid range being 1 to 9999 with leading zeros added (i.e. 0001, 0023) when necessary to create a four digit unique identifier. This 2010 Census block layer is based on the U.S. Census Bureau Census 2020 TIGER/Line files. The boundaries are an extract of aerial photography and cartographic information, such as roads and streams, from the Loudoun County GIS system. Census Blocks are bounded on all sides by visible features, such as roads, streams, lakes, power lines, and railroad tracks, and/or by non-visible boundaries such as town and county boundaries, and short line-of-sight extensions of streets and roads.</SPAN></P></DIV></DIV></DIV> boundary Census boundaries demographic boundaries <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data.</SPAN></P></DIV></DIV></DIV> Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. none: Employee generated boundary, census, boundaries, demographic, blocks none: Employee generated Virginia, Loudoun, County Loudoun County, VA, Department of Management and Financial Services Demographer 1 Harrison St. SE Leesburg VA 20175 MS 41 (703) 777-0563 8:30-5:00 EST, M-F ArcGIS Metadata 1.0 dataset Tiles GDB ESRI Personal Geodatabase Feature Class Loudoun County, VA, OMAGI Public Information Counter 1 Harrison Street S.E., 2nd floor Leesburg VA 20175 mapping@loudoun.gov MS 65 (703)771-5778 (703)771-5075 8:00-4:30 EST, M-F Loudoun County distributes spatial data in ArcGIS database or shapefile & DXF format for the cost of reproduction. Countywide spatial datasets may be purchased for $22 per DVD for up to 4.5 GB of data. There is a $100 surcharge to purchase countywide topography, and a $3 charge if the item is to be mailed. If the customer wants the data in DXF format and/or would like OMAGI to custom select specific geographic areas of the County, there is an additional $7 per 15 minute increment labor charge. Select aerial imagery is also available. Size limit: 4.5 GB. Visit our website at: http://www.loudoun.gov/omagi, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests. SHP ESRI Shapefile DXF AutoCad Digital Exchange File File Geodatabase Feature Class NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet EPSG 8.9.3(9.0.0) 5882 Loudoun County, VA, OMAGI Metadata Specialist Demographic data source for population, housing units, and households for census tracts U.S. Census Bureau, 2010 Decennial Census summary file 2011-02-08T00:00:00 Provided the foundation upon which census blocks were drawn. The 2010 Census blocks were the basis for devising the census tract boundaries. U.S. Census Bureau TIGER/Line files 2010-10-12T00:00:00 Loudoun County Government GIS provided base layer for digitizing block boundaries Loudoun County GIS data Census block shapefile downloaded from the U.S. Census Bureau. Overlaid the Census Bureau shapefile with with Loudoun County Government's detailed GIS layers to determine the actual location of the physical features, natural features, and governmental units such as town boundaries that the census blocks are designated to follow. Digitized lines using Loudoun County Government's detailed GIS layers. 2011-01-10T00:00:00 Loudoun County, VA Office of Mapping and Geographic Information (OMAGI) This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF products. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata.