St. Marys, KS population, income and ZIP codes

St. Marys city is a small town in Kansas, with 2,795 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #96 of 740 ranked by population — larger than 87% of them. The median age here is 25.8 years against 39.1 nationally, a distinctly younger profile, typical of places with students, military posts or a fast-growing family population. At this population the ACS sample is small, so the margin of error around every dollar figure below is wide — treat the numbers as a band, not a point, and expect them to move between annual releases without the place itself changing.

Households in St. Marys city earn a median of $71,723 a year, 8.7% below the national figure of $78,538 and 13% above the $63,750 median for the 200 Kansas 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 7.9% of residents here, below the 12.4% national rate.

The typical owner-occupied home in St. Marys city is valued at $196,300, 35.3% below the national figure and 50% above the $131,300 peer median, while median gross rent runs $863 a month, 38.6% below the national figure, or roughly $10,356 across a full year. A household on the local median income would put about 14.4% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 2.7×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 64.6% of occupied homes are owner-occupied versus 65% nationally, so the market leans more heavily on renters. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

A median age of 25.8 means a large student or early-career population; income medians in places like this understate household resources, since many residents are supported from outside the address.

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.