You’re likely here because you need the zip code for Kenilworth NJ, which is 07033. It’s a five-digit number that gets your Amazon packages to the right porch and ensures your voter registration doesn't end up in a different county. But honestly, if you live here or you’re planning to move, that number represents a very specific, two-mile-wide slice of Union County that most people drive right past on the Garden State Parkway.
Kenilworth is small. We’re talking about a borough that covers just roughly 2.1 square miles.
Because it’s so compact, the 07033 zip code covers almost the entire town. You won't find the confusing multi-zip sprawl you see in nearby Elizabeth or Newark. Here, it’s mostly one and done. However, there is a tiny overlap with 07083 (Union) near the borders, so if you’re right on the line near Galloping Hill, it’s always worth double-checking your specific street address on the official USPS look-up tool.
What Exactly is the Zip Code for Kenilworth NJ?
The primary designation is 07033.
If you are filling out a formal document, you might see a request for the "Zip+4." For the Kenilworth Post Office located at 520 Boulevard, that extended code is 07033-9998. Most residential blocks carry their own unique four-digit suffix, which helps the mail carriers at the Boulevard station sort things faster than a standard scan.
A Quick Snapshot of 07033
- Primary City: Kenilworth, NJ
- County: Union County
- Area Code: 908
- Time Zone: Eastern Standard Time (EST)
- Land Area: ~2.1 square miles
Life Inside the 07033 Lines
What makes this zip code unique isn't the number itself, but the weirdly perfect balance of "industrial powerhouse" and "quiet suburbia."
One minute you’re walking past the well-manicured lawns near Harding Elementary School, and the next, you’re looking at massive pharmaceutical facilities. Kenilworth is famously the home of Merck’s global headquarters. This means the 07033 zip code handles a massive amount of corporate logistics alongside suburban mail.
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The "Boulevard" is the heart of the town.
It’s the main vein of the 07033 area. If you’re looking for a bagel, a haircut, or a quick slice of pizza at Capri, you’re going to be on the Boulevard. It’s got that classic New Jersey "Main Street" feel that’s becoming harder to find in the era of giant shopping malls and sprawling lifestyle centers.
Real Estate and Demographics
According to recent 2024 and 2025 census estimates, the population within the zip code for Kenilworth NJ hovers around 8,500 people. It’s a stable community. People tend to move here and stay. The median home value in 07033 has climbed significantly over the last few years, now often sitting well above $520,000.
Most of the housing stock consists of charming Capes, Colonials, and the occasional newer construction where an older home was replaced.
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The History of the 07033 Designation
Before it was Kenilworth, this area was known as "New Orange."
Can you imagine? It sounds like a Florida retirement community. Thankfully, the founders realized it was getting confused with the other "Oranges" in Essex County (East Orange, West Orange, etc.). In 1907, they incorporated as Kenilworth, named after a literary society called the Kenilworth Club.
The post office became a central fixture of the town’s identity. Back in the day, the Rahway Valley Railroad was the lifeblood of 07033. While the trains don't run the same way they used to, that industrial heritage is why the town has such a high concentration of businesses for its small geographic size.
Why Most People Get 07033 Wrong
A common mistake involves the "Union" border.
Because Kenilworth is bordered by Union, Cranford, Roselle Park, and Westfield, the GPS can sometimes get a bit wonky. People living near the Galloping Hill Golf Course often think they are in Union (07083), but if you’re paying taxes to the Kenilworth borough, you’re almost certainly in 07033.
Another weird quirk? Tin Kettle Hill.
It was a famous landmark in the northeast part of town used during the Revolutionary War as a beacon site for George Washington’s troops. Today, that area is part of the 07033 landscape, though the hill itself was largely leveled years ago to provide fill for railroad tracks.
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Actionable Tips for Using the Kenilworth Zip Code
If you are moving to the area or setting up a business in 07033, here is what you actually need to do:
- Verify the +4 Code: If you’re shipping high-value items to a business on the Boulevard, use the full Zip+4. It drastically reduces "return to sender" errors in the industrial zones.
- Check the County: Ensure your insurance documents list Union County. Sometimes automated systems try to default to Essex because of the "07" prefix common in Newark.
- Local Mail: If you need a P.O. Box, the Kenilworth Post Office is at 520 Boulevard. It’s a small, friendly station, but parking on the Boulevard can be tight during the lunch rush.
- Schools: The 07033 zip code aligns with the Kenilworth Public Schools district (Harding and David Brearley). Always confirm your address on the district map if you're buying specifically for the schools.
Whether you're just looking to address an envelope or you're researching a move to this corner of Union County, knowing the zip code for Kenilworth NJ is just the start. It’s a small town with a massive footprint, tucked right into the busiest part of the state, holding onto its own unique 07033 identity.