The State of California has designated certain historical places special enough to be designated a Historical Landmark. These locations are designated by a stone monument with a plaque describing the Historical Landmark. These Landmarks are erected by local organizations after gaining approval from the State.

In Union City, there are two such Historical Landmarks.

California Historical Landmark #503 : First County Court House

"Site first Court House where Alameda County government began, June 6, 1853. Officials met in two-story wooden building erected by Henry C. Smith and A. M. Church as merchantile store. Seat of government moved to San Leandro in 1855, following vote of people of county in December 1854."

The plaque was erected in 1953. The building was destroyed by fire in the 1890's.

Location of Plaque: Corner of Smith St. and Union City Blvd.

California Historical Landmark #768 : Site of Nations First Successfull Beet Sugar Factory

"The factory was built in 1870 by E.H. Dyer, 'father of the American beet sugar industry.' Located on a corner of Dyer's farm, the small factory began processing sugarbeets in November 15, 1870, and produced 293 tons of sugar during its first operating season. The plant has since been completely rebuilt on the original site."

This plaque was erected in 1962. Since then the factory has been demolished and replaced with housing.

Location of Plaque: Corner of Dyer Ave and Ratekin Dr.