So, you're looking at Greenwich. Maybe you're planning a move, or maybe you're just curious why a single town in Fairfield County needs so many different ways to sort its mail. Honestly, it’s confusing. People talk about "Greenwich" like it’s one big, monolithic slab of wealth, but if you’ve spent any time driving from the rocky coastline of Old Greenwich up to the horse farms of Backcountry, you know that’s just not true.
The Greenwich Connecticut zip codes are basically a secret language. They don't just tell the mailman where to drop your Amazon packages; they tell everyone exactly which "flavor" of Greenwich you’ve chosen. There are five main ones: 06830, 06831, 06807, 06870, and 06878.
The Downtown Pulse: 06830
This is the one most outsiders think of when they hear the name. It covers Central Greenwich. If you want to be able to walk to Greenwich Avenue to grab a coffee at CFCF or a high-end dinner at L’Escale, you’re looking at 06830.
It’s dense. Relatively speaking, anyway. You’ve got a mix of massive, gated estates in areas like Belle Haven and much tighter clusters of condos and townhomes near the train station. According to recent 2025 market data, the median sale price here hovers around $2.1 million, but that’s a bit of a lie—it’s skewed by the fact that you can buy a $700,000 condo or a $30 million waterfront mansion in the exact same zip code.
The Forest and the Farms: 06831
Drive north. Keep going past the Merritt Parkway. That’s 06831. This is "Backcountry" and Glenville territory. It’s quiet. Like, really quiet. You’re trading walkability for four-acre zoning and enough space to keep a horse or a very large, very private pool.
One thing people get wrong? They think 06831 is just for the ultra-wealthy. While it’s home to some of the most expensive real estate in the country, the Glenville side (closer to the New York border) actually has a much more "neighborhood" feel. It’s got its own little village center with a Stop & Shop and a pizza place. But generally, if your address ends in 831, you’re probably spending a lot of time in your car.
The "Village" Life: 06870 and 06878
These two are the siblings of the Greenwich family. 06870 (Old Greenwich) and 06878 (Riverside).
Old Greenwich feels like a movie set. It’s got that classic New England beach town vibe. You’ve got the village shops on Sound Beach Avenue and, of course, Tod’s Point (Greenwich Point Park). If you live here, you’re likely biking to the beach in the summer.
Riverside, right next door, is slightly more suburban. It’s where people go when they want a little more yard than Old Greenwich offers but still want to be close to the water and the Riverside train station. Interestingly, 06878 often clocks in as one of the wealthiest zip codes in the entire state based on adjusted gross income—sometimes even beating out the big estates in 06831.
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The Under-the-Radar Spot: 06807
Then there’s Cos Cob. It’s the 06807 zip code. Historically, it was a hub for the American Impressionist art movement, and it still feels a bit more "artsy" and grounded than the rest of the town.
It’s often the entry point for families moving out of New York City who want the Greenwich schools and services but don't want the "Gold Coast" flash. You get a lot of character here—older homes, hilly streets, and a very cool library that’s basically the heart of the community.
Why the Numbers Actually Matter
You might wonder why anyone cares about a five-digit number. In most of America, they don't. But in Greenwich, the zip code dictates your lifestyle more than your tax rate does.
- The Commute: If you work in Manhattan, living in 06830 or 06878 is a dream. You’ve got multiple Metro-North stations. If you’re in 06831, you’re looking at a 15-minute drive just to get to the station.
- The Vibe: Do you want to see your neighbors every morning at the local deli (06870), or do you want to not even know their names because their driveway is half a mile long (06831)?
- The Price Tag: As of early 2026, inventory is still incredibly tight. Homes in 06870 and 06878 often sell in under 30 days because everyone wants that "walk-to-town" lifestyle.
Practical Steps for Your Search
If you're trying to figure out which Greenwich Connecticut zip code fits you, don't just look at Zillow. Do this instead:
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- Visit on a Tuesday morning. See what the traffic is like near the train stations.
- Walk the neighborhoods. Specifically, walk from the Old Greenwich train station to the village. Then drive to the Round Hill Road area in 06831. The difference is jarring.
- Check the flood zones. Especially in 06870 and 06878. Living near the water is great until a nor'easter comes through.
- Look at the "Tax Districts." Greenwich is one town, but some areas have slightly different services or associations that might affect your bottom line.
Greenwich is a patchwork. It’s not just one place. Whether you’re looking for the high-octane energy of downtown or the silent woods of the north, picking the right zip code is the first real step in becoming a local.