Car Insurance in Portsmouth, NH

Portsmouth is a great place to drive until it isn’t. A summer Saturday hunting for parking near Market Square, an icy Spaulding Turnpike ramp in January, a slow crawl over the Piscataqua River Bridge into Maine. Portsmouth Atlantic Insurance is an independent agency on Islington Street, and we’ve been putting together car insurance for Seacoast drivers since 2005. Whether you call it car insurance or auto insurance, we compare it across 40+ carriers, so the policy gets built around how you actually drive and what you have to protect.

We opened in 2005, we’re licensed in 10 states, and we’re New Hampshire’s highest-rated agency on Google, with 1,000+ Google reviews and over 2,000 testimonials from the people we insure.

Does New Hampshire Require Car Insurance?

New Hampshire doesn’t require most drivers to buy auto insurance. What the state does require is financial responsibility. Under RSA 264:20, proof of financial responsibility means being able to pay $25,000 for injury to one person, $50,000 when two or more people are hurt, and $25,000 for property damage. The New Hampshire Insurance Department’s auto insurance guide explains that if you can’t meet those requirements after an at-fault accident, your driving privileges may be suspended, and a court could order your assets used to pay the damages.

If you do buy a policy, the same guide says the minimum liability limits are 25/50/25. New Hampshire law also requires at least $1,000 of medical payments coverage and uninsured motorist coverage. Under RSA 264:15, when you choose liability limits above the minimum, your uninsured motorist coverage automatically matches the higher limits.

Some drivers don’t get a choice. The NH Division of Motor Vehicles can place a driver under an insurance filing requirement, which means carrying a policy and having the insurer file an SR-22 certificate. For a longer walk-through, read our post Does New Hampshire Require Car Insurance?.

In practice, after a reportable crash, a driver or owner with no liability policy in force can have their license and registration suspended until they post security for the damages and show proof of financial responsibility going forward (RSA 264:3). Skipping insurance doesn’t remove the obligation; it just means paying yourself. A 2026 bill to require proof of insurance at registration, HB 1558, was killed in the House in February 2026 (Citizens Count). Our New Hampshire auto insurance guide covers the rest.

Why the State Minimum Rarely Fits a Portsmouth Household

The 25/50/25 limits are a floor, not a recommendation. A crash involving a newer SUV, a couple of passengers and a damaged guardrail on I-95 can run past those numbers quickly. Whatever the policy doesn’t pay becomes your problem, and if you own a home in Portsmouth, Rye or New Castle, have retirement savings, or earn a strong income, those are the assets an injured person’s attorney will look at.

Coverage	State minimum policy	Built around your household
Bodily injury liability	$25,000 per person / $50,000 per crash	Higher limits sized to the home, savings and income you need to protect
Property damage liability	$25,000	Higher limit for crashes involving newer vehicles or roadside property
Uninsured motorist	Required, at the minimum	Automatically rises to match your liability limits (RSA 264:15)
Medical payments	At least $1,000	Chosen with your health coverage in mind
Personal umbrella	Not included	Optional layer on top of auto and home

Why Uninsured Motorist Coverage Matters in New Hampshire

Because a policy is optional for most New Hampshire drivers, you can’t assume the driver who hits you has insurance, or enough of it. Uninsured motorist coverage pays for injuries to you, your family and your passengers when the at-fault driver can’t, and it also applies to hit-and-run crashes.

Under RSA 264:15, your uninsured motorist limit automatically matches the liability limit you choose, so raising your limits above 25/50/25 protects your own household too. Our guide to auto liability insurance shows how the limits work, and our umbrella insurance calculator helps you size an umbrella.

Driving in Portsmouth: Seacoast Roads, Winter and the Commute

Local driving shapes the coverage you need. Portsmouth sits where I-95, the Route 1 Bypass and the Spaulding Turnpike come together, with the Memorial and Sarah Mildred Long bridges carrying traffic to Kittery. If you commute to Pease International Tradeport, the Portsmouth Naval Shipyard in Kittery or down toward Boston, you’re adding highway miles and bridge traffic to every week. Downtown means tight streets, parking garages and door dings around Market Square.

I-95, the Portsmouth Traffic Circle and the Route 1 Bypass

The Portsmouth Traffic Circle is where I-95, the Spaulding Turnpike (NH 16) and the US 1 Bypass meet, and the New Hampshire Department of Transportation has been replacing lighting at and around the circle, with shoulder closures and narrowed ramps, as part of a project scheduled to finish in spring 2027 (NHDOT). Merging traffic, work zones and trucks heading for the bridges are part of daily driving here.

That makes per-accident liability, glass coverage for stones thrown up by trucks, and rental reimbursement and towing worth a close look. Ask us whether a glass deductible option is available with the carrier you choose.

Three bridges to Kittery and the Portsmouth Naval Shipyard

Three bridges cross the Piscataqua River between Portsmouth and Kittery: the high-level Piscataqua River Bridge on I-95, the Sarah Mildred Long Bridge on the US 1 Bypass, and the Memorial Bridge on US 1 downtown (Maine-New Hampshire Bi-State Bridge Study). The Memorial Bridge was rebuilt and reopened in 2013 (City of Portsmouth). The replacement Sarah Mildred Long Bridge, a lift bridge, opened to traffic in March 2018 and serves as the backup route when the I-95 bridge is disrupted (NHPR; Hardesty & Hanover). The Portsmouth Naval Shipyard sits on Seavey Island in Kittery (NAVSEA), so many Portsmouth drivers cross into Maine every workday.

Your New Hampshire policy goes with you into Maine, and most policies meet another state’s required limits while you drive there. If you move across the river or register a car in Maine, Maine requires financial responsibility (29-A M.R.S. § 1601) of at least $50,000 per person, $100,000 per accident and $25,000 for property damage, plus medical payments and towing coverage (29-A M.R.S. § 1605). Moving over? See our Kittery and York, Maine pages.

Route 1 and Route 1A along the coast

Route 1 (Lafayette Road) carries Portsmouth’s shopping and commuter traffic south toward Hampton, while Routes 1A and 1B form the New Hampshire Coastal Byway, which follows the coastline for about 22 miles between Seabrook and Portsmouth (NH Coastal Byway Corridor Management Plan). Summer brings beach traffic and cyclists; winter brings salt spray and coastal storms. Our Rye and New Castle pages cover homes along the route, and our Portsmouth flood insurance guide explains which parts of the city flood.

Downtown parking, garaging and snow bans

The city’s Hanover Garage has about 900 spaces and the Foundry Place Garage about 600 (City of Portsmouth, Garages). When the city declares a snow emergency parking ban, cars left on city streets during the ban are ticketed and towed, and residents can use the garages at a flat resident rate while the ban is on (City of Portsmouth, Snow Impacts). In the downtown business area, a ban runs from 1 AM to 9 AM when needed.

For your policy, the key detail is the garaging address, where the car actually spends the night. Tell us whether it’s a garage, a driveway or the street, and update it when you move. A scrape from an unknown driver in a garage is usually a collision claim, subject to your deductible. If you own a downtown unit, our Portsmouth condo insurance page covers that side, and renters can start with renters insurance in New Hampshire.

Winter driving on the Seacoast

Then there’s the weather: nor’easters, freezing rain, road salt and deer along the back roads toward Greenland and Newington. Comprehensive coverage is what pays for a fallen branch, a deer strike, theft or flood damage to your car. The New Hampshire Insurance Department notes that a flood insurance policy doesn’t cover cars, and flood damage to a vehicle is generally covered only if you bought comprehensive on your auto policy. If you park near the water in the South End, Peirce Island or along Route 1A, that matters.

Clear the whole car before you leave, roof included. New Hampshire’s negligent driving law is the statute that requires drivers to clear snow and ice, and a first offense carries a $250 to $500 fine (RSA 265:79-b). Ice that flies off your roof and damages the car behind you can also become a liability claim.

Bundling Car and Home Insurance in Portsmouth

Most Portsmouth households insure more than a car: a house or condo, maybe a boat or a summer place. Keeping auto, home and umbrella coordinated means the liability limits line up and there are no gaps between policies. Our New Hampshire home and auto insurance bundle page explains how we put the pieces together, and homeowners insurance in New Hampshire covers the home side. For larger homes, see Portsmouth high-value home insurance. Learn more on our auto insurance page, or about the office on our Portsmouth, NH insurance agency page.

More for Portsmouth and Nearby Drivers

Driving up the Spaulding Turnpike? See our Dover car insurance page. Heading inland on Route 101? Our Exeter car insurance page covers that side of the Seacoast. Neighbors can also find us on our Greenland, Newington and Hampton pages. Client reviews are on our client feedback page.

A Local Independent Agency on Islington Street

As an independent agency, we don’t work for one insurance company. We work for you, compare 40+ carriers and explain the differences in plain English. Our Portsmouth office is at 601 Islington St, Unit 206, Portsmouth, NH 03801. We serve Connecticut from our Fairfield, CT office and by phone, email and online, and because we’re licensed in 10 states, we can help when a child heads off to school or a vehicle is garaged at a second home in another state.

By Jon Merwin, Founder and CEO, Licensed Insurance Advisor. Last reviewed October 2026.

Car Insurance FAQs for Portsmouth, NH

Sources

• New Hampshire Insurance Department, Automobile Insurance Consumer Frequently Asked Questions
• NH RSA 264:20, Amount of Proof of Financial Responsibility
• NH RSA 264:15, Uninsured or Hit-and-Run Motor Vehicle Coverage
• NH Division of Motor Vehicles, Insurance Requirements / SR-22
• New Hampshire Insurance Department, Flood Insurance: Protecting Granite State Homes and Property
• NH RSA 264:3, When Proof Required After Report of Accident
• NH RSA 264:25, Conduct After Accident
• NH RSA 263:14, Youth Operator Licenses
• NH RSA 265:79-b, Negligent Driving
• Citizens Count, HB 1558 (2026): killed in the House
• Maine Revised Statutes, 29-A § 1601, Required maintenance of financial responsibility
• Maine Revised Statutes, 29-A § 1605, Proof of financial responsibility
• NHDOT, Day Time Shoulder Closures on I-95 in Portsmouth
• MaineDOT and NHDOT, Bi-State Bridge Study final report (Memorial, Sarah Mildred Long and I-95 High Level bridges)
• Hardesty & Hanover, The Sarah Mildred Long Bridge Opens to Traffic (2018)
• NHPR, Sarah Mildred Long Bridge opens (2018)
• City of Portsmouth, Portsmouth Memorial Park and the Memorial Bridge
• NAVSEA, Portsmouth Naval Shipyard fact sheet
• New Hampshire Coastal Byway Corridor Management Plan (2015)
• City of Portsmouth, City Garages
• City of Portsmouth, Snow Impacts and parking bans