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Allentown, fading into a map of Allentown

Living InAllentown

Allentown is a historic borough in western Monmouth County, with a National Register historic district along Main Street.

County
Monmouth
Population
1,734 (2020 Census)
Land area
0.60 sq mi
Water area
0.03 sq mi

Photo: Apc106, Wikimedia Commons, CC BY-SA 3.0 · Map data © OpenStreetMap contributors

Allentown is a small borough in western Monmouth County, on the border with Robbinsville in Mercer County and surrounded otherwise by Upper Freehold Township. Its center is the Allentown Historic District, listed on the National Register of Historic Places, with 219 contributing buildings along Main Street and the streets around it, including the Allentown Mill and the John Imlay House from about 1790.

Many of the borough's historic houses stand inside the district. The shopping district has antique and specialty shops and restaurants, and Heritage Park sits near the shops. Conines Millpond lies along High Street, and the Horse Park of New Jersey is nearby in Upper Freehold.

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Selling Allentown

Whether you're buying, selling, or just curious about the market, these videos are packed with tips, success stories, and market trends.

Understanding the NEW Buyer Agency Laws in New Jersey

My Professional Background laid the groundwork for what I am today

NEW Buyer (& Seller) Agency EXPLAINED for New Jersey Real Estate

Notable Neighborhoods In Allentown

Pick a number to see where each area sits. Most of these areas have no official border, so each pin marks its heart rather than its edges.

The tall stucco Allentown Mill building with shop signs at street level

MARKET SNAPSHOT

Allentown At A Glance

County Routes 524, 526 and 539 run through Allentown, with Interstate 195 and the New Jersey Turnpike reachable from outside the borough; I-195 leads west toward Trenton and Princeton. It is about 50 miles in a straight line to Penn Station in Manhattan and about 34 miles to Philadelphia City Hall. Want to know what homes are selling for right now? Ask Dennis Mark for an Allentown market snapshot.

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Market Snapshot

Allentown Real Estate September 2026

  • Median sale price, September

    $624,500

    Based on 2 sales

  • Homes sold, September

    2

    1 in September 2025

  • Median sale price, 2026 so far

    $635,000

    13 homes have sold this year, with the median up 12.9% from last year

  • Homes for sale in September

    7

    1 in September 2025

  • Median days on market

    54 days

    For homes sold in September

  • Months of supply

    5.6 months

    How long the homes for sale would last at the current pace of sales

Email me Allentown’s snapshot every month

Source: MOMLS (Monmouth Ocean Multiple Listing Service), Market Summary, Residential, September 2026, pulled October 5, 2026. Residential sales reported to the MLS; deemed reliable but not guaranteed. These are MLS figures, not Dennis Mark’s own. For what your home could sell for today, ask for a home value.

Photo: Jack and Dianne, Flickr, CC BY-SA 2.0

Browse Listings

Find homes for sale in Allentown here.

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Local Spotlight

The independent restaurants, cafés and shops that make Allentown feel like home.

Local Favorites

Local, independent businesses only, each confirmed open September 2026. Business list from OpenStreetMap contributors. Logos belong to their businesses and are shown to identify them. Own a local business in Allentown? Ask to be featured.

Allentown Q&A

Straight answers to common questions about Allentown, each with its source. Checked September 2026.

What county is Allentown, NJ in?

Monmouth County, New Jersey. Allentown is in the western part of the county and borders Robbinsville Township in Mercer County. Sources: NJ Department of Labor, Census 2020 municipal populations and Wikipedia, Allentown.

Is Allentown, NJ the same as Allentown, PA?

No. Allentown, New Jersey is a small borough in western Monmouth County. It is not related to the city of Allentown in Pennsylvania. Source: Wikipedia, Allentown.

What is the ZIP code for Allentown, NJ?

08501. Some places in neighboring Upper Freehold Township also have Allentown mailing addresses, such as the Horse Park of New Jersey, so an Allentown address is not always in the borough. Check the municipality on the property record. Source: Wikipedia, Allentown.

What is the population of Allentown, NJ?

1,734 people at the 2020 Census. The Census Bureau's estimate for July 1, 2025 is 1,741. Sources: NJ Department of Labor, Census 2020 municipal populations and U.S. Census Bureau, 2025 population estimates.

How big is Allentown, NJ?

About 0.60 square miles of land and about 0.03 square miles of water. Source: U.S. Census Bureau 2020 Gazetteer.

Is Allentown part of Upper Freehold Township?

No. Allentown is its own borough. It was incorporated on January 29, 1889, from part of Upper Freehold Township, and it borders Upper Freehold and Robbinsville. The two towns share the Upper Freehold Regional School District. Source: Wikipedia, Allentown.

How did Allentown, NJ get its name?

It was named either for Nathan Allen, son-in-law of settler Robert Burnet, or for William Allen, a Chief Justice of the Province of Pennsylvania. Source: Wikipedia, Allentown.

Is Allentown, NJ a historic town?

Yes. The Allentown Historic District, about 17 acres along North and South Main streets, Church, Pearl and Hamilton streets, Lakeview Drive and Yardville Road, was added to the National Register of Historic Places on June 14, 1982. It includes 219 contributing buildings, among them the Allentown Mill, listed on its own in 1978, and the Georgian-style John Imlay House from about 1790. Source: Wikipedia, Allentown.

Success Stories

Real stories from the people we've helped buy and sell their homes.

I would 10/10 recommend him to anyone!!!

Dennis helped us buy our current house and has both professional work ethic and is extrememly knowledgeable. He was always there to answer any questions we had and was very patient with us in the process. I would 10/10 recommend him to anyone and he will continue to be our agent for any future needs.

SPENCER & SARAH RAITT-FOREST

57 Google reviews as of October 2026. Read them all on Dennis Mark’s Google Business Profile.

Dennis Mark Interdonato, Keller Williams Realty Ocean Living

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Fall Festival on Main Street. Photo: Jack and Dianne, Flickr, CC BY-SA 2.0

Allentown Insider Insights

Advice for buying and selling a home in New Jersey.

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Understanding Property Taxes and Their Impact on Monthly Mortgage Payments in New Jersey

Buying a home in New Jersey is exciting, but many homebuyers overlook one key component of homeownership: property taxes . New Jersey consistently ranks among the states with the highest property taxes in the U.S.,…

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