Elmira is a census-designated place (CDP) in Solano County, California, United States. The population was 188 at the 2010 census.
Elmira, California, is named after Elmira, New York.
In the 19th and early 20th century, Elmira was the major railroad stop between Fairfield and Davis. To get to Vacaville, travelers had to take a spur from Elmira. When U.S. Route 40 was built through Vacaville, the population of Vacaville increased in size, while the population of Elmira declined.
According to the United States Census Bureau, the CDP has a total area of 0.531 square miles (1.38 km2), all of it land.
The 2010 United States Census reported that Elmira had a population of 188. The population density was 353.9 people per square mile (136.6/km2). The racial makeup of Elmira was 150 (79.8%) White, 10 (3.5%) African American, 10 (5.3%) Native American, 2 (1.1%) Asian, 0 (0.0%) Pacific Islander, 17 (9.0%) from other races, and 8 (4.3%) from two or more races. Hispanic or Latino of any race were 47 people (25.0%).
The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized.
There were 85 households, 20 (23.5%) had children under the age of 18 living in them, 34 (40.0%) were opposite-sex married couples living together, 6 (7.1%) had a female householder with no husband present, 7 (8.2%) had a male householder with no wife present. There were 6 (7.1%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships.