Extract from the 1870 Census:
Name: Ole Berg
Age in 1870: 29
Estimated birth year: 1841
Birthplace: Norway
Race: white
Sex: male
Relation to head-of-house: head
Home in 1870: Duluth Ward 4, Saint Louis, Minnesota
Post office: Duluth
Value of personal property: $500
Occupation: saloon keeper
Census place: Duluth Ward 4, Saint Louis, Minnesota; Roll: M593_10; Image: 286
Date: 16 Jul 1870

Extract from the 1880 Census:
Name: Ole Berg
Age: 39
Estimated birth year: 1841
Birthplace: Norway
Race: white
Sex: male
Relationship to head-of-household: head
Home in 1880: Duluth, Saint Louis, Minnesota
Address: 4th Avenue East
Marital status: married
Father's birthplace: Norway
Mother's birthplace: Norway
Occupation: laborer
Census place: Duluth, Saint Louis, Minnesota; Roll: T9_632; Family History Film: 1254632; Page: 511.3000; Enumeration District: 92; Image: 0674
Date: 18 Jun 1880

Extract from the 1900 Census:
Name: Ole A Berg
Age at last birthday: 59
Date of birth: Mar 1841
Birthplace: Norway
Race: white
Sex: male
Relationship to head-of-house: head
Home in 1900: Duluth Ward 7, Saint Louis, Minnesota
Address: 317 22nd Avenue West
Marital status: married
Number of years of marriage: 30
Able to read, write and speak English: yes
Father's birthplace: Norway
Mother's birthplace: Norway
Year of immigration: 1866
Number of years in the United States: 34
Naturalization: yes
Farm or home: home
Home owned or rented: owned
Mortgage: yes
Occupation: merchant grocery
Census place: Duluth Ward 7, Saint Louis, Minnesota; Roll: T623 790; Page: 12A; Enumeration District: 284
Date: 6 Jun 1900

Extract from the 1910 Census:
Name: Ole A Berg
Age in 1910: 69
Estimated birth year: 1841
Birthplace: Norway
Race: white
Sex: male
Relationship to head of family: head
Home in 1910: Duluth Ward 7, Saint Louis, Minnesota
Address: 317 22nd Avenue West
Marital status: married
Number of years of present marriage: 39
Able to speak English: yes
Able to read and write: yes
Father's birthplace: Norway
Mother's birthplace: Norway
Year of immigration: 1866
Whether naturalized or alien: naturalized
Farm or house: house
Home owned or rented: owned; no mortgage
Occupation: janitor
Type of industry: Court House
Salary or wage worker: wages
Whether out of work on April 15, 1910: no
Number of weeks out of work in 1909: 0
Census place: Duluth Ward 7, Saint Louis, Minnesota; Roll: T624_725; Page: 17B; Enumeration District: 184; Image: 668
Date: 28 Apr 1910

In 1867 he emigrated from Norway to the United States to LaCrosse, Wisconsin, and moved to Duluth, Minnesota in the fall of 1869, walking the 150 miles from Saint Paul, Minnesota over the military road.
He filed a declaration to become a United States citizen 25 Mar 1870 before the 7th District Court of the State of Minnesota, stating that he was born in Norway about 1841 and immigrated to the United States through Detroit, Michigan in June, 1867.
He married Grethe Olyne Hovden 28 Nov 1870 in Duluth when she was 17 and he was 29. They had 12 children, four of whom died as children.
He owned a grocery store for a long time at 2103 West Superior Street in Duluth. His partner was a man named Stenrud.
"Ole Berg had a barrel of rice in his grocery store, from which rice was sold by the measure, and there was a Chinese laundry in the basement. One day he cleaned out the barrel, and found that the Chinaman had bored through the floor into the barrel, and had been tapping the rice."
He was a Saint Louis County Commissioner from 1896 to 1905. Later he worked as a custodian at the Saint Louis County Courthouse. He also owned several rental properties which he had built.

Obituary from the "News-Tribune" of Duluth, Minnesota dated May 1915:
Here Before Stage Coach
Ole A. Berg, Who Came to Duluth in 1869, Dies.
Ole A. Berg, who walked from St. Paul to Duluth in 1869, before the stages were running, and established a home here when Superior street was a cowpath and Duluth boasted of but half a dozen houses, died at his home, 317 Twenty-second avenue west, shortly before 8 o'clock this morning. He was 74 years of age.
Interested in stories of the new city that was to grow up at the head of Lake Superior, Mr. Berg left La Crosse, Wis., early in 1869 and went to St. Paul, coming here from the Twin Cities with a pack sack on his back.
His first residence was near the present ship canal at the foot of Lake avenue, where Duluth's few buildings were clustered. There were no streets laid out until several years later.
Mr. Berg worked as a mason in the early days, helping in the construction of many of the city's first buildings. He later entered the grocery business, and for the last few years has been custodian at the courthouse. He was county commissioner for eight years in the '90s, and was a member of the Old Settlers' association.
He leaves a wife, six daughters and two sons. The daughters are: Mrs. W. C. Newark, Mrs. Stella Widner, Mrs. S. A. Rhode, Miss Laura Berg, Miss Olyne Berg and Miss Nina Berg of Charlotte, Mich. The sons are Sidney and Marvin, both of whom live in Duluth.
Funeral arrangements have not been completed.

Funeral notice from the "News-Tribune" of Duluth, Minnesota dated 26 May 1915:
Funeral of Duluth Pioneer Friday
The funeral of Ole A. Berg, age 74, pioneer resident of Duluth, who died at his home, 317 North Twenty-second avenue west, early yesterday morning, will be held tomorrow afternoon at 2 o'clock from the West End Undertaking parlors, 2118 West First street. Rev. Stemple White will conduct the services. Interment will be made at the Scandia cemetery.
Members of the Old Settlers' association will turn out in a body to attend the funeral. Mr. Berg had been a member of this organization for several years. He had resided in Duluth for forty-six years.