Sometimes it is the Sign Department. In the Bellevue, Washington area the was a street named Northup Road. Some where along the way signs started showing up that said Northrup Road. Now all the signs say that even thought it was named after a person named Northup.

Same here in the San Antonio area. The name of a road where at one time there was a large native American settlement was Red Land Road. Over the last few years the new signs going up say Redland Road. There are both types within a half a mile of each other.

http://www.911.state.tx.us/browse.php/9-1-1_Contacts

They seemed to have changed the site between the time I posted and now.

This is data that is paid for with tax dollars. You have to request the data. The data is used buy a number of groups as well as commercial companies to make maps.

NathanO