Eras of County Creation in Texas, 1835-1921
The geographic requirements for the creation of Texas counties outlined in the Constitution of 1876 (Art.9) led to the creation of counties with regular – often square – shapes across the state's western frontier.
Source: A list of Texas counties by date of creation was compiled from various online sources notably http://www.texasbob.com/txt_county.html, accessed June 3, 2003. Also consulted were the lists at http://www.nationmaster.com/encyclopedia/List-of-Texas-counties, http://www.bryansite.com/countyTX.htm, and http://www.naco.org/Template.cfm?Section=Find_a_County&Template=/cffiles /counties/state.cfm&statecode=tx.