A house on Bonnett Avenue and a house on Bonnie Briar Lane both carry a Larchmont, NY 10538 address. Both sit within a few minutes of the train station. Both are zoned to the same schools. If you pulled up either listing on a portal, nothing in the address would tell you that one of these homes pays a property tax bill the other one never sees.
Bonnett Avenue sits inside the incorporated Village of Larchmont. Bonnie Briar Lane sits in the unincorporated area of the Town of Mamaroneck. That distinction, confirmed street by street on the Town's own Local Roads by Municipality list, determines which government sends you a bill, how many bills you get, when they arrive, and who actually plows your street or picks up your trash. For a buyer comparing two "Larchmont" homes, this is the detail that the median price on a listing site will never surface.
A Post Office, Not a Property Line
The confusion is baked into the town's history. The Town of Mamaroneck was created in 1788, but by the 1890s it had split into three governing pieces because a town, under state law at the time, couldn't provide much beyond basic administration. Larchmont Manor residents wanted real water, sewer, garbage and police service, so in 1891 they got a charter and incorporated their own village, expanding the boundary beyond the Manor's original 288 acres to meet the state's population density requirement. The Village of Mamaroneck incorporated a few years later. What was left over became the unincorporated area, still legally part of the Town of Mamaroneck but never folded into either village.
Here's the part that trips up buyers today: a large stretch of that unincorporated area gets its mail through the Larchmont Post Office and therefore carries a Larchmont address, according to background on the town's formation. The zip code was never redrawn to match the governing lines. So "Larchmont" as a mailing address and "Village of Larchmont" as a taxing authority are two different things, and only one of them shows up on a listing sheet.
Four Bills, Three Governments, Three Calendars
If your home is inside the incorporated Village, you are a customer of three separate governments, and each one bills you on its own schedule. According to the Village Treasurer's own property tax page, the calendar looks like this:
| Bill | Billed by | Published | Due |
|---|---|---|---|
| Town & County tax | Town of Mamaroneck | April 1 | April 30 |
| Village tax | Village of Larchmont | June 1 | June 30 |
| School tax, first half | Mamaroneck Union Free School District | September 1 | September 30 |
| School tax, second half | Mamaroneck Union Free School District | January 1 | January 31 |
That's four due dates spread across the calendar year, from three boards that budget independently, hold separate public hearings, and answer to different sets of voters.
If your home is in the unincorporated area instead, there is no fourth bill. You still pay Town, County and school taxes, but instead of a Village tax you're funding the Town's own highway, fire, garbage, street lighting and water funds directly, since the Town of Mamaroneck provides police, fire and sanitation straight to unincorporated residents rather than through a village government, per the Town's own explanation of how its three sections work. The Village of Larchmont, by contrast, runs its own police department and its own public works crews for the roughly one square mile inside its boundary.
Neither structure is better on its face. They're just different products, priced and delivered differently, and the address on the for-sale sign won't tell you which one you're buying.
The Layers Don't Move at the Same Speed
Here's where it gets useful for anyone actually comparing carrying costs. Because the Village, the Town and the school district each set their own budgets, their tax levies don't rise in tandem, and a low increase from one doesn't protect you from a high increase in another.
The clearest recent example comes from the budget cycle for the fiscal year that began June 1, 2025. Village Administrator Justin Datino projected a Village tax levy increase of roughly 2.5%, and the Village stayed under the state's tax cap. In the very same cycle, the Town of Mamaroneck adopted a levy increase north of 15% for Village and Village of Mamaroneck residents, and the school district proposed an increase close to 5%, according to reporting from Larchmont Loop, the hyperlocal news outlet that has covered Mamaroneck and Larchmont finances since 2007. The piece was written by Michael Gottfried, a 28-year Village resident who spent more than a decade on Larchmont's own Finance Committee, and it flagged an added wrinkle: a running dispute inside the Larchmont-Mamaroneck Joint Sanitation Commission over the fact that homeowners, not businesses or nonprofits, absorb most of the sanitation cost in the Village's budget.
The takeaway isn't that any one of these governments is mismanaging money. It's that a homeowner inside the Village looking at "my Village rate only went up 2.5%" was still absorbing a double-digit jump from the Town in the same twelve months. The number that matters for your wallet is the sum of three unrelated decisions, not the one your real estate portal happens to display.
The Line Is Moving Again This Year
The pattern held into the following cycle. For the 2026 calendar-year Town budget, published in December 2025, the Town Board's preliminary numbers were "tax-cap-compliant" for the first time in years, coming in under the state's 2.83% cap. Under that plan, the tax levy for unincorporated-area homeowners was set to rise about 2.96%, while the Town levy charged to both villages was set to rise 2.36% before either village added its own tax on top, according to Larchmont Loop's coverage. That same reporting noted a new seven-member Finance Committee, drawn from both Mamaroneck and Larchmont, formed after residents pushed back hard on the prior year's increases.
Separately, the Village's own Board of Trustees had a proposed local law on its March 23, 2026 meeting agenda that would authorize a budget for the fiscal year beginning June 1, 2026, with a tax levy exceeding what the state's cap formula would otherwise allow. That fiscal year is already underway as of this writing, which means the actual outcome of that vote is sitting on this year's June-dated Village tax bill right now. If you're closing on a Village home this year, that bill, not last year's, is the one to ask for.
Through all of this, the Village of Larchmont has maintained a AAA rating from Moody's, a marker of fiscal stability that's worth knowing even though it doesn't tell you what your bill will be next June.
What This Means When You're Comparing Two "Larchmont" Listings
If you're weighing two homes that both carry a Larchmont address, a few extra steps early in the process save real confusion later.
- Confirm jurisdiction before you fall for the listing. Ask the listing agent, or check the Town's Local Roads by Municipality list, to find out whether the specific street is inside the Village of Larchmont or the Town's unincorporated area.
- Request the actual current tax bills, not a blended estimate. A combined "effective rate" from a third-party site can flatten three separate levies into one number that hides which government is driving the total.
- Map the payment calendar against your own cash flow. A Village property means four due dates across the year: April, June, and two in the school year. An unincorporated property means fewer separate bills but the same underlying obligations bundled differently.
- Ask what services come with the jurisdiction. Village residents get Village police and Village-run sanitation. Unincorporated residents get those services directly from the Town. Neither is inherently worth more, but they're not identical, and it's fair to ask what's included.
- Check the most recent budget cycle for each layer. Because the Village, Town and school district set levies independently and on their own calendars, last year's percentage increase for one of them tells you little about this year's number for another.
None of this changes what a home is worth to you. It does change what it actually costs to hold, and that's the number that shows up on your mortgage statement, not the portal listing.
Frequently Asked Questions
Does being inside the Village of Larchmont mean better schools? No. Both the incorporated Village and the surrounding unincorporated area are zoned to the Mamaroneck Union Free School District. Incorporation affects which government bills you and delivers municipal services. It doesn't change your school assignment.
How do I find out if a specific address is inside the Village or the unincorporated area? The Town of Mamaroneck publishes a Local Roads by Municipality list that identifies jurisdiction street by street, and either the Village or Town assessor's office can confirm it for a specific parcel.
Is a Village address always the more expensive option? Not necessarily, and that's the whole point. A Village home carries an extra tax layer, but the size and direction of your total bill depends on how the Village, Town and school levies have each moved that year. The only reliable way to compare two homes is to pull the actual current bills for both, not to assume the pattern from a prior year will repeat.
Jurisdiction lines like this rarely show up in a listing description, but they show up every year on your tax bill. If you're comparing homes in Larchmont, or anywhere else in Southern Westchester, and want someone who checks this kind of detail before you write an offer, Kristin Bischof can walk through the specifics with you and get you early access to new listings as they come to market.
