Bismarck's Fire Protection Rating has gone from Class 3 to Class 2, according to the Insurance Services Office.
Only 1.7% of cities in the United States are Class 2 or better.
The scale ranges from 1 to 10, 1 being "Superior" and 10 "does not meet standards."
The rank is based on training, emergency response and prevention.
Bismarck is the first city in North Dakota, South Dakota and Minnesota to reach Class 2.
"The leadership here in Bismarck through the City Commission set a priority on their strategic plan and their investment in public safety and we're very proud to be a part of that and to deliver the service that we can to Bismarck," Fire Chief Joel Boespflug said.
The ISO uses fire protection ratings to set fair premiums for fire insurance.
Boespflug says most cities rank between Classes 5 and 7.