Tennant, CA has a population of 61 and is the 27,893rd largest city in the United States. The population density is 251 per sq mi which is 8% higher than the California average and 177% higher than the national average. The median age in Tennant is 27 which is approximately 26% lower than the California average of 36. In Tennant, 89% of the population over 15 years of age are married, 89% speak English and 11% speak Spanish. 33% of Tennant residents were born in California, 67% were born out of state, 0% were born outside of the United States and 0% were foreign born.