St. Johns city, AZ population, income and ZIP codes

St. Johns city is a small town in Arizona, with 3,409 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #115 of 467 ranked by population — larger than 75% of them. The median age here is 26.7 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. Johns city earn a median of $128,920 a year, 64.1% above the national figure of $78,538 and 103% above the $63,545 median for the 206 Arizona 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 6.9% of residents here, below the 12.4% national rate.

The typical owner-occupied home in St. Johns city is valued at $180,900, 40.4% below the national figure and 25% below the $242,700 peer median, while median gross rent runs $881 a month, 37.3% below the national figure, or roughly $10,572 across a full year. A household on the local median income would put about 8.2% 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 1.4×, against roughly 3.9× nationally, so purchase prices are unusually low against local pay, the pattern in places where supply is plentiful and wage growth has been flat. 89.2% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. 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 26.7 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.

Every value on this page is published directly by the Census for this area — nothing is modelled or interpolated. 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.