![enter image description here][1] [Tiger - the US Census Bureau GIS data][2]. Covers the US only. * Municipal and state boundaries * Cartographic maps * Street maps From my personal experience, the data is comprehensive, accurate and well-formed. Last update - 2011. [1]: https://i.sstatic.net/U3NLB.png [2]: http://www.census.gov/geo/www/tiger/