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1. 1:1,000,000-Scale County Boundaries of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands, by showing the counties as ar... Geological Survey (U.S.).

2. 1:1,000,000-Scale National Wilderness Preservation System of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.

3. 1:1,000,000-Scale State Boundaries of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

4. Global Map: 1:1,000,000-Scale Political Areas of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile includes Global Map data showing the counties and equivalent entities of the United States, Puerto Rico, and the U.S. Virgin... National Atlas of the United States.

5. 1:1,000,000-Scale State Boundaries of the United States, 2012

2012. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

6. Texas voting districts from 2010 Census

2010. US Census Bureau, Geography Division. Voting districts in Texas based on the US decennial Census of 2010. The TIGER/Line shapefiles and related database files (.dbf) are an extract of s...

7. Indian Lands of the United States, 2006

2006. National Atlas of the United States. This polygon shapefile shows Indian lands of the United States. Only areas of 640 acres or more are included. Federally-administered lands within a... National Atlas of the United States.

8. Fees and Easements, South Central U.S., Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for the south central United States. The USGS Protected Areas Database o... Gap Analysis Program (U.S.).

9. County Boundaries of the United States, 2000

2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

10. Elementary School Districts, Texas, 2000

2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the elementary school district boundaries in Texas. School districts are geographic entities within which state, ... U.S. Census Bureau. Geography Division.

11. Unified School Districts, Texas, 2000

2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in Texas. School districts are geographic entities within which state, cou... U.S. Census Bureau. Geography Division.

12. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

13. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

14. Federal Lands of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of... National Atlas of the United States.

15. National Wilderness Preservation System of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

16. State Boundaries of the United States, 2005

1972. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).

17. Time Zones of the United States, 2005

1972. National Atlas of the United States. This polygon shapefile portrays the time zones of the United States, Puerto Rico, and the U.S. Virgin Islands. Also included are the Greenwich Mean... National Atlas of the United States.

18. Houston, TX (City Limits, 2003)

Houston (Tex.). City Planning Department. Houston City Limit boundary line and the area within. This data is part of the 2003 City of Houston GIS Release 9 available in the GIS Lab in Rotch... Houston (Tex.). City Planning Department.