Old Greenwich, CT population, income and ZIP codes

Old Greenwich CDP is a mid-size town in Connecticut, with 6,904 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #53 of 215 ranked by population — larger than 75% of them. The median age here is 40.5 years against 39.1 nationally, a slightly older profile than the country as a whole. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Old Greenwich CDP earn a median of $250,001 a year, 218.3% above the national figure of $78,538 and 159% above the $96,484 median for the 159 Connecticut cities we cover. The median is the midpoint household, not an average, so a handful of very high earners cannot drag it upward the way they distort a mean. Poverty reaches 3.3% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Old Greenwich CDP is valued at $1,668,200, 449.8% above the national figure and 385% above the $344,200 peer median, while median gross rent runs $3,501 a month, 149% above the national figure, or roughly $42,012 across a full year. A household on the local median income would put about 16.8% 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 6.7×, 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. 85.4% 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. 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 6.7× 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.

No figure on this page is estimated by us; each one comes straight from the published ACS tables for this area. 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.