ML
Mary Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Whatcom-County, Washington
Our Model Tree links this Mary Larson across the 1900, 1910, 1920, 1930 and 1940 US Censuses in Whatcom-County, Washington (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 2-person household.
Age 75
b. ~1865
Female
Head
Born: Denmark
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Whatcom-County, Washington |
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Widowed |
| Birthplace | Denmark |
| 1935 Residence (City) | Blaine City |
| 1935 Residence (County) | Whatcom |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
| Township / Ward | Blaine City |
| Est. Birth Year | ~1865 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Larson | Head | — | 75 | ~1865 |
| Peter Larson | Son | — | 48 | ~1892 |
Census Appearances
1900
Whatcom, Washington
Spouse, age 34
Whatcom, Washington · implied b. ~1866 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Denmark |
| Birth Month | Nov |
| Birth Year | 1866 |
| Year of Immigration | 1888 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
Head, age 43
Whatcom, Washington · implied b. ~1867 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Widowed |
| Birthplace | Denmark |
| Children Born | 5 |
| Children Living | 3 |
| Year of Immigration | 1888 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1920
Whatcom, Washington
Head, age 54
Whatcom, Washington · implied b. ~1866 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Widowed |
| Birthplace | Denmark |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Denmark |
| Year of Naturalization | 1896 |
| Birthplace (normalized) | denmark |
1930
Whatcom, Washington
Other, age 63
Whatcom, Washington · implied b. ~1867 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Head-H |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Widowed |
| Birthplace | Denmark |
| Naturalization Status | Naturalized |
| Year of Immigration | 1888 |
| Age at First Marriage | 25 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read/Write | Yes |
| Mother Tongue | Danish |
| Home Owned/Rented | R |
| Home Value / Rent | 200 |
| Radio Set | R |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
1940
Whatcom-County, Washington
Head, age 75
Whatcom-County, Washington · implied b. ~1865 — 2 household members
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Widowed |
| Birthplace | Denmark |
| 1935 Residence (City) | Blaine City |
| 1935 Residence (County) | Whatcom |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | Denmark |
| Birthplace (normalized) | denmark |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Larson across 5 US Census years (1900, 1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Larson
Head · 1940 · age 75 · b. ~1865 · Washington
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Whatcom-County, Washington
Open full size
1940 US Federal Census — Whatcom-County, Washington
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04369-00037)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John B. Dry | 66 | Head | — | Germany |
| 2 | Grant L. Newton | 43 | Head | Clerk | Minnesota |
| 3 | Marguerite B. Newton | 40 | Wife | — | Canada |
| 4 | Florence Holtzheimer | 77 | Head | — | Iowa |
| 5 | Emma E. Holtzheimer | 60 | Daughter | — | Washington |
| 6 | Albert Stitt | 76 | Head | Proprietor | Canada English |
| 7 | Junie D. Stitt | 67 | Wife | — | Canada English |
| 8 | Richard G. Oertell | 39 | Head | 1/3 Prop. | Canada |
| 9 | Vera E. Oertell | 39 | Wife | — | Washington |
| 10 | Katherine E. Oertell | 8 | Daughter | — | Washington |
| 11 | Richard W. Oertell | 4 | Son | — | Washington |
| 12 | Doris A. Oertell | 1 | Daughter | — | Washington |
| 13 | Robert D. Pruett | 47 | Head | Div. Fishing | So. Dakota |
| 14 | Gertrude H. Pruett | 39 | Wife | — | Iowa |
| 15 | Dorothy E. Pruett | 15 | Daughter | — | So. Dakota |
| 16 | Bruce R. Pruett | 13 | Son | — | So. Dakota |
| 17 | Herbert D. Walser | 50 | Head | Laborer | Illinois |
| 18 | Elsie M. Walser | 43 | Wife | — | West Virginia |
| 19 | Donald E. Walser | 25 | Son | Clerk-Extra | Arkansas |
| 20 | Herbert L. Walser | 16 | Son | — | Washington |
| 21 | Thos. Byron | 47 | Head | — | England |
| 22 | Margaret Byron | 38 | Wife | — | California |
| 23 | Norma M. Byron | 12 | Daughter | — | California |
| 24 | Goodrun G. Byron | 82 | Mother | — | Iceland |
| 25 | Robert A. Oertell | 78 | Head | Part Owner | Germany |
| 26 | Regina C. Oertell | 79 | Wife | — | Ohio |
| 27 | Mary Larson THIS PERSON | 75 | Head | — | Denmark |
| 28 | Peter M. Larson | 48 | Son | Elect. Eng. | Washington |
| 29 | Susan Simonsen | 46 | Head | Selling | Iowa |
| 30 | Steinie M. Finnson | 30 | Head | Proprietor | Washington |
| 31 | Clella W. Finnson | 22 | Wife | — | Canada |
| 32 | Douglas G. Finnson | 1 | Son | — | Washington |
| 33 | Chas. W. Brandon | 47 | Head | Carpenter-Painter | Missouri |
| 34 | Adeline Brandon | 47 | Wife | — | Sweden |
| 35 | Daily Neva L. Brandon | 22 | Daughter | — | So. Dakota |
| 36 | Judith A. Brandon | 1 | G. Daughter | — | Washington |
| 37 | Axel B. Nelson | 26 | Head | Prop. Man | Sweden |
| 38 | Dorothy A. Nelson | 19 | Wife | — | Washington |
| 39 | Gary D. Nelson | 1 | Son | — | Washington |
| 40 | Claude B. Schering | 29 | Head | Teacher | Washington |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)