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Sonoma Public Infrastructure (formerly TPW)

Roads Division
County Of Sonoma › Development Services › Sonoma Public Infrastructure (formerly TPW) › Divisions › Roads › Data and Resources › Postmile System
Roads Division

Postmile System

Transportation and Public Works is now Sonoma Public Infrastructure - Website updates coming soon!

Postmile System Map

Go to full-screen interactive map


Legend

Bridge 4 Bridge MiC2 State or US Highway County Maintained Road County-Maintained

What is a postmile?

A postmile (AKA post mile) is a numerical value that identifies a specific linear location along a County road, based on its distance (in miles) from the beginning of the road (e.g. if you are at postmile 10.00, then postmile 11.00 is one mile up the road). All Sonoma County roads have designated beginning and ending post mile assignments.