Somersworth, NH Zip Code: What You Need To Know

Bill Taylor

-Nov 13, 2025

Somersworth, NH Zip Code: What You Need to Know

If you're looking for the zip code for Somersworth, New Hampshire, you've come to the right place. Somersworth has one primary zip code: 03878.

This guide provides comprehensive information about the 03878 zip code, including its boundaries, demographics, and the services it covers. Whether you're moving to Somersworth, sending a package, or just need to verify an address, this information will be helpful.

Understanding Zip Codes

Zip codes, or Zone Improvement Plan codes, are postal codes used by the United States Postal Service (USPS) to streamline mail delivery. They consist of five digits, and in some cases, a four-digit extension is used to further specify a location.

Zip codes help the USPS route mail efficiently by dividing areas into smaller segments. This system ensures that mail reaches its destination quickly and accurately. — Savage, MN Weather: Your Complete Guide

Why Zip Codes Matter

Efficient Mail Delivery: Zip codes are crucial for sorting and delivering mail effectively.
Geographic Identification: They help identify specific geographic locations.
Data Analysis: Zip codes are used in demographic studies and market research.
Shipping and Logistics: Businesses rely on zip codes for shipping and logistics planning.

The 03878 Zip Code: Covering Somersworth, NH

The 03878 zip code is assigned exclusively to Somersworth, New Hampshire. This means that all addresses within the city limits use this zip code.

Boundaries and Coverage

The 03878 zip code encompasses the entire city of Somersworth, which is located in Strafford County, New Hampshire. Somersworth is situated on the Salmon Falls River, which forms the border between New Hampshire and Maine. The zip code covers both residential and commercial areas within the city.

Key Areas Within 03878

The 03878 zip code includes:

Downtown Somersworth
Residential neighborhoods
Commercial districts along Main Street and High Street
Schools, parks, and other public facilities

Using the 03878 Zip Code

When addressing mail or packages to Somersworth, NH, always use the 03878 zip code to ensure proper delivery. The format should be:

[Recipient Name]

[Street Address]

Somersworth, NH 03878

Somersworth, NH: An Overview

Somersworth is a city with a rich history and a vibrant community. Knowing more about the city can provide context for understanding the significance of its zip code.

History and Background

Somersworth was first settled in the 17th century and was initially a farming community. The city later developed into a major textile manufacturing center during the Industrial Revolution. Today, Somersworth is a diverse city with a mix of residential, commercial, and industrial areas.

Demographics

As of recent data, Somersworth has a population of around 11,766 residents. The city offers a mix of housing options, from historic homes to modern apartments, making it an attractive place for families and individuals alike.

Local Economy

Somersworth's economy includes a variety of sectors, such as manufacturing, retail, healthcare, and education. The city is also home to several small businesses and local shops, contributing to its unique character.

Community and Culture

Somersworth has a strong sense of community, with numerous local events, festivals, and organizations. The city's downtown area features historic architecture and is home to a variety of shops, restaurants, and cultural attractions. — Free Games No Ads: Enjoy Gaming Without Interruptions

Nearby Zip Codes and Areas

Understanding the surrounding zip codes can be helpful for those who frequently travel to or from Somersworth. Here are some nearby zip codes and areas:

Dover, NH (03820): Located to the east of Somersworth, Dover is a larger city with a variety of amenities and services.
Rochester, NH (03867): Situated to the north, Rochester is another major city in Strafford County.
Berwick, ME (03901): Just across the Salmon Falls River, Berwick is a town in Maine that shares a border with Somersworth.
South Berwick, ME (03908): Also in Maine, South Berwick is another neighboring town with close ties to Somersworth.

Finding More Information

If you need to verify a specific address or find additional details about the 03878 zip code, here are some resources:

United States Postal Service (USPS): The USPS website offers a zip code lookup tool and other helpful resources.
City of Somersworth Official Website: The city website provides information about local services, government, and community events.
Strafford County Government: The county government website offers resources related to local governance and services.

Conclusion

The zip code for Somersworth, NH, is 03878. This code is essential for accurate mail delivery and serves as a key identifier for the city. Whether you are a resident, business owner, or visitor, understanding the zip code system and its applications can be very beneficial.

By providing detailed information about the 03878 zip code and the city of Somersworth, this guide aims to be a comprehensive resource for all your zip code-related inquiries.

Frequently Asked Questions (FAQs)

1. What is the zip code for Somersworth, NH?

The zip code for Somersworth, New Hampshire, is 03878.

2. Where is Somersworth, NH located?

Somersworth is located in Strafford County, New Hampshire, on the Salmon Falls River, which forms the border between New Hampshire and Maine. — Pine Grove PA Weather: Forecast & Conditions

3. What areas does the 03878 zip code cover?

The 03878 zip code covers the entire city of Somersworth, including residential neighborhoods, commercial districts, and public facilities.

4. How can I use the zip code to address mail to Somersworth?

To address mail to Somersworth, use the following format: