San Marcos, CA population, income and ZIP codes

San Marcos city is a small city in California, with 94,078 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #81 of 1,618 ranked by population — larger than 95% of them. The median age here is 36.8 years against 39.1 nationally, a slightly younger profile than the country as a whole. At this size the Census also publishes one-year estimates; the five-year values used here are steadier and let you compare against smaller neighbours on the same basis.

Households in San Marcos city earn a median of $105,286 a year, 34.1% above the national figure of $78,538 and 16% above the $91,111 median for the 1,050 California cities we cover. This figure covers the household, not the worker: two people on ordinary wages at one address outrank a single professional in the same table. Poverty reaches 10.2% of residents here, below the 12.4% national rate.

The typical owner-occupied home in San Marcos city is valued at $792,400, 161.2% above the national figure and 34% above the $589,600 peer median, while median gross rent runs $2,191 a month, 55.8% above the national figure, or roughly $26,292 across a full year. A household on the local median income would put about 25% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is within the standard affordability guideline. The home-price-to-income ratio works out to 7.5×, against roughly 3.9× nationally, so buying is out of reach on local earnings alone and the ownership market leans on outside income, equity or dual high earners. 63% of occupied homes are owner-occupied versus 65% nationally, so the market leans more heavily on renters. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

Home values sit at 7.5× median household income, far past the 3.9× national mark, so ownership costs here are set by something other than local wages — second homes, retirees with equity, or commuters earning elsewhere.

All values below were released by the Census for this exact geography, with no gap-filling on our side. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.