The Dinnie Brothers was a construction firm in Grand Forks

Grand Forks, North Dakota

Grand Forks is the third-largest city in the U.S. state of North Dakota and the county seat of Grand Forks County. According to the 2010 census, the city's population was 52,838, while that of the city and surrounding metropolitan area was 98,461...

 and Fargo, North Dakota

Fargo, North Dakota

Fargo is the largest city in the U.S. state of North Dakota and the county seat of Cass County. In 2010, its population was 105,549, and it had an estimated metropolitan population of 208,777...

. They built over 60 percent of the commercial buildings in Grand Forks, and much of downtown Fargo after the Fargo Fire of 1893.

Each of the two Dinnie brothers, John Dinnie and James Dinnie, served as mayor of Grand Forks.

According to a 1981 survey of historic resources in what was later designated the Downtown Grand Forks Historic District area

The heyday of the resource area with its many beautifully constructed brick buildings corresponds to the era of fine craftsmen in bricklaying, between 1880 and the 1930s. Two of the outstanding bricklayers in Grand Forks were Sander Johnson and the Dinnie Brothers, John and James. The Dinnie Brothers firm was established in Grand Forks in 1881. John and James began as common bricklayers and expanded their business into the largest construction firm in the Red River Valley by 1909, at which time they owned extensive interests in brickyards in eastern North Dakota....

Sander Johnson laid brick for the Dinnie Brothers at the turn of the century and constructed his first building in 1907, laying the brick himself. Johnson's older brothers were employed by the Dinnie Brothers and Henry Johnson eventually took over
the Dinnie firm in the 1930s.

Works by the firm include:

• Dinnie Apartments
  Dinnie Apartments
  Dinnie Apartments is a building in Grand Forks, North Dakota that was listed on the National Register of Historic Places in 1994. It was the first block of "spacious and elegant" townhouses built in Grand Forks, in the "heyday" of growth of the city...
  
  , 102-108 Fourth Ave. S, Grand Forks, ND (Dinnie Brothers) NRHP-listed
• Masonic Temple
  Masonic Temple (Grand Forks, North Dakota)
  The Masonic Temple is a Renaissance style building in Grand Forks, North Dakota. It was designed by architect Joseph Bell DeRemer and was constructed by the Dinnie Brothers in 1913...
  
  , 413-421 Bruce Ave., Grand Forks, ND (Dinnie Brothers) NRHP-listed
• Ramsey County Sheriff's House, 420 6th St., Devils Lake, ND (Dinnie Bros.) NRHP-listed
• New Hampshire Block, NRHP-listed