Search "Harrington Park home prices" this week and you can find three answers that do not agree with each other. One page says the median sale price over the past year sits around $853,000. Another, from the same site, puts it closer to $985,000. A third landing page for the identical trailing twelve months lands on $1,027,000. None of these numbers are wrong exactly. They are just measuring a market too small to hold still long enough to be measured cleanly.
I work Harrington Park and the towns around it, including Old Tappan next door, and I get some version of this question from almost every buyer comparing the two: which number do I trust? The honest answer is that the disagreement itself is the useful information. It tells you something about how these two Northern Valley towns actually trade, and it is not what most people assume from a single portal snapshot.
The Same Town, Three Different Numbers
Harrington Park is a little over two square miles with roughly 5,000 residents, one public school for elementary and middle grades, and a housing stock that leans heavily on Cape Cods, colonials, and a handful of midcentury homes on generous lots. It is a genuinely small place, and that smallness shows up directly in its price data.
Redfin's own tracking shows the median price per square foot in Harrington Park climbing to $470, up 25.5% year over year. That is a startling number if you read it the way most buyers do, as proof that the whole town got a quarter more expensive in twelve months. It almost never means that. A jump that size in a market this thin usually means the mix of homes that happened to sell changed, not that every homeowner's equity moved overnight.
At the same time, active inventory tells its own story. Zillow lists 7 homes for sale in Harrington Park. Trulia lists 5. Redfin's housing-market data shows just 2 completed home sales in the borough in October 2025, down from 6 in October 2024. Homes.com's own sold-homes page counts 37 total sales over its trailing twelve-month window, which averages out to roughly three closings a month across the whole town.
Three sales a month is not a market you can summarize with one clean median. It is a market where the specific three houses that happen to close in any given stretch determine the headline number almost entirely.
Twelve Houses a Year Cannot Set a Stable Median
Compare that to Old Tappan, one town over and often cross-shopped by the same buyers. Redfin's numbers show 15 homes sold in Old Tappan in May 2026, up from 12 in May 2025. That is roughly five times the sales volume Harrington Park saw in its slowest reported month.
| Harrington Park | Old Tappan | |
|---|---|---|
| Monthly closings (per Redfin) | 2, in October 2025 | 15, in May 2026 |
| Active listings (Zillow) | 7 | 37 |
| Reported median sale price | roughly $850,000 to $1.03 million, depending on the page | roughly $1.0 to $1.1 million across sources |
| Price per square foot trend | up 25.5% year over year (Redfin) | up 10.9% year over year (Redfin, three months ending May 2026) |
Old Tappan's numbers still move around some. Zillow's home-value index put the average Old Tappan home at $1,263,706 as of June 2026, up 7.0% over the past year, while Homes.com's trailing twelve-month sold median sits closer to $1 million and down slightly from the year before. The spread is still narrower than Harrington Park's. That is not because Old Tappan is a fundamentally more stable town. It is because more transactions smooth out the noise. When 15 houses close in a month instead of 2, one unusually large or unusually modest sale has far less power to drag the whole median in one direction.
This is the part most home-price research skips. A rising or falling median in a market this size is not automatically a signal about demand. Sometimes it is just sample size doing what small samples do.
The Teardown Effect
There is a second layer to Harrington Park's numbers, and it has a name attached to it. RWS Building & Remodeling, a design-build firm based right in Harrington Park, markets itself specifically around teardown-and-rebuild projects alongside new construction and custom homes. That is not incidental. Listings marketed in Harrington Park this year have described exactly this pattern: a level, roughly one-third-acre lot rebuilt into close to 4,000 square feet with 5 bedrooms and 5.1 baths, a gourmet kitchen, and an expansive primary suite.
When a house like that closes, it enters the same twelve-month sales count as a 1,400-square-foot Cape Cod down the street. The dollar-per-square-foot math for the new build looks nothing like the math for the older home, and because Harrington Park has so few total sales in any given year, one or two of these rebuilds can pull the town-wide price-per-square-foot figure sharply upward without a single existing homeowner's property actually appreciating that much.
If you are watching Harrington Park's headline numbers climb and wondering whether your own mid-century ranch just got 25% more valuable, the more accurate read is narrower: a different kind of house entered the sales mix this year. That is useful to know before you price a listing or size up an offer.
What Old Tappan Looks Like From the Ground
Old Tappan's larger transaction volume comes with a wider range of housing stock to match, early 20th-century Colonial Revivals, midcentury ranch-style homes, and contemporary colonial farmhouses, often on lots built for multi-car garages and room to grow. Daily life centers on the Bi-State Plaza, home to Butterworths Bagel & Bakery and La Bona Pizza, along with a nearby ShopRite for groceries. Residents looking to spend a weekend outdoors have the 9-hole Old Tappan Golf Course in town and the semi-private River Vale Country Club close by.
That combination, more housing variety and more monthly closings, is exactly why Old Tappan's price data holds together more consistently across different sources than Harrington Park's does. It is not a statement about which town is the better buy. It is a statement about which town's numbers you can trust at face value and which town's numbers require a second look.
What This Means If You're Comparing the Two Towns
If Harrington Park and Old Tappan are both on your list, a few habits will serve you better than trusting any single portal's median:
- Ask for actual closed comparables from the last 60 to 90 days, not a trailing twelve-month average that may include a handful of unusual sales.
- Find out whether a listing is new construction on a rebuilt lot or an original-vintage home. In Harrington Park especially, these are functionally two different markets sharing one town-wide statistic.
- Treat any year-over-year percentage change from Harrington Park with some skepticism until you know what specific houses drove it. A 25% swing in a town this size can come from three sales, not three thousand.
- Compare square footage and lot size directly across both towns rather than relying on a single median price, since the age and style range in both is wide enough that price alone tells you very little about what you would actually be buying.
A Few Questions Worth Asking Directly
Does this mean Harrington Park homes are worth less than the numbers suggest? No. It means the town-wide statistics are noisier than they look, not that the underlying homes are less desirable. Harrington Park's price-per-square-foot figures remain well above the national average by any source's count, and the borough's park system, small school, and tree-lined streets continue to draw steady interest.
How should I judge whether a specific asking price is reasonable? Look at recent closed sales of a similar vintage and style within the same few months, rather than the trailing-year median. In a town this small, that is the only comparison that actually reflects what buyers are paying for a comparable home right now.
Comparing two towns this closely takes more than pulling up a portal and reading the first number that appears. If you are weighing Harrington Park against Old Tappan, or trying to figure out what a specific listing's price actually reflects, I would rather walk you through the real comparables than let a trailing-twelve-month average make the decision for you.
Lana Henriques has spent more than 14 years working these Northern Valley towns block by block. If you are ready to talk specifics about either market, reach out and let's go through it together.
