Union Map
The City of Union is located in Napa County in the State of California. Find directions to Union, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2019 US Census the Union population is estimated at 74,501 people. The Union time zone is Pacific Daylight Time which is 8 hours behind Coordinated Universal Time (UTC).
Nearby cities include Salvador, Napa, Wingo, El Verano, Big Bend.