Every mailing address in New York City's northernmost borough starts with the prefix 104, but what those remaining two digits reveal goes far beyond mail sorting. Bronx zip codes map out neighborhood boundaries, historic shifts, and deep socioeconomic divides across the borough's 42 square miles.
The United States Postal Service assigns ZIP codes using a regional breakdown system. For New York, the opening digit 1 signifies the northeastern region of the nation, while 104 specifically designates Bronx County. When you look closer at the sequence, the final two digits map out localized postal routes and delivery stations operated by the USPS. Let's dive into how these numbers are structured and what they tell us about the borough.
The Anatomy of a Bronx Zip Code
Every five-digit postal code in the United States follows a strict hierarchical logic. In the Bronx, that logic tells a precise story about how mail moves from regional sorting hubs down to individual carrier routes.
The first three digits—104—identify the sectional center facility (SCF) serving the Bronx. Mail originating from anywhere in the country bound for the Bronx first routes to a primary processing plant. From there, the fourth and fifth digits direct the mail to specific local carrier stations, substations, or large-volume institutional addresses.
For instance, codes in the 1045x range often serve the South and West Bronx, while 1046x and 1047x cover central, eastern, and northern sections like Pelham Bay and Throggs Neck. It's a system built for logistical speed, but it has accidentally created clear statistical boundaries used by urban planners and researchers.
Major Bronx Zip Codes and Their Neighborhoods
The borough spans dozens of distinct neighborhoods, each anchored by specific postal zones. Knowing which code covers which area prevents costly shipping errors and misdirected deliveries.
West and Northwest Bronx
- 10463: Covers Kingsbridge, Marble Hill, and Spuyten Duyvil near the northern tip bordering Manhattan.
- 10471: Encompasses Riverdale and Fieldston, known for hilly terrain, detached homes, and historic properties.
- 10468: Serves Fordham, Kingsbridge Heights, and the campus areas surrounding Fordham University.
South and Central Bronx
- 10451: Covers the Concourse area, home to the Bronx County Courthouse and Yankee Stadium.
- 10455: Serves Mott Haven, one of the borough's fastest-evolving commercial and residential districts.
- 10456: Covers Morrisania and Claremont, representing some of the most densely populated residential blocks in the city.
East and Northeast Bronx
- 10461: Encompasses Morris Park and Van Nest, featuring a mix of multi-family homes and local retail strips.
- 10462: Serves Parkchester, famous for its mid-20th-century planned garden apartment community.
- 10475: Covers Co-op City, the largest cooperative housing development in the world.
Socioeconomic Patterns Behind the Numbers
Postal data acts as an open window into local demographics. Because city agencies, health departments, and the U.S. Census Bureau organize data by ZIP code tabulation areas (ZCTAs), we can track stark contrasts within the borough.
For example, median household incomes vary widely depending on the neighborhood zone. Wealthier residential pockets in the north, such as Riverdale (10471), report median earnings significantly higher than the borough average. Conversely, historical disinvestment and economic shifts left parts of the South Bronx (such as Mott Haven or Hunts Point) with lower median incomes and different public health challenges.
Population density tells a similar story. Areas dominated by high-rise apartment complexes and multi-family brownstones register tens of thousands of residents per square mile. Meanwhile, lower-density suburban-style enclaves near the Westchester border feature much lower crowding metrics.
Common Mistakes When Using Bronx Addresses
People unfamiliar with New York City geography frequently mix up borough boundaries and postal routing. Avoid these frequent errors:
- Confusing Manhattan and the Bronx: Marble Hill (10463) sits physically on the mainland connected to the Bronx, yet it historically remains part of Manhattan borough for certain administrative purposes, while retaining a Bronx postal address.
- Dropping the Borough Name: Writing just "New York, NY" with a 104xx zip code can occasionally route mail through Manhattan sorting facilities first, adding transit delays. Always specify "Bronx, NY".
- Assuming ZIP Codes Equal Neighborhoods: Postal boundaries rarely match official neighborhood lines. A single ZIP code might cross multiple community board districts or merge distinct local enclaves.
Frequently Asked Questions
How many zip codes are in the Bronx?
There are roughly 35 active ZIP codes dedicated to residential, commercial, and institutional delivery in Bronx County, ranging from 10451 to 10475.
Does every Bronx address start with 104?
Yes. Every standard postal code assigned to Bronx County begins with the prefix 104, distinguishing it from Manhattan (100, 101, 102), Brooklyn (112), Queens (111, 113, 114, 116), and Staten Island (103).
Why do some zip codes cover such small areas?
High-density urban areas require smaller postal zones because a single high-rise apartment building or commercial block generates enough mail volume to justify its own dedicated carrier routes.
Can I look up demographic data using a Bronx zip code?
Yes. Researchers use ZCTAs provided by the U.S. Census Bureau to pull population, income, and housing statistics for specific postal boundaries.
