MN
Mary Nelson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Nelson across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 4-person household.
Age 59
b. ~1881
Female
Spouse
Born: Finland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Naturalization Status | Naturalized |
| Additional Details | |
| Industry | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
| Township / Ward | Berkeley |
| Est. Birth Year | ~1881 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Nelson | Head | — | 62 | ~1878 |
| Dorothy Nelson | Other | — | 28 | ~1912 |
| John Nelson | Son | — | 29 | ~1911 |
| Mary Nelson | Spouse | — | 59 | ~1881 |
Census Appearances
1920
Alameda, California
Spouse, age 39
Alameda, California · implied b. ~1881 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Finland |
| Year of Immigration | 1900 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Finnish |
| Birth Country | Finland |
| Year of Naturalization | 1903 |
| Birthplace (normalized) | finland |
1930
Alameda, California
Spouse, age 49
Alameda, California · implied b. ~1881 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Finland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1893 |
| Age at First Marriage | 21 |
| Father's Birthplace | Finland |
| Mother's Birthplace | Finland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
1940
Alameda-County, California
Spouse, age 59
Alameda-County, California · implied b. ~1881 — 4 household members
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Finland |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Naturalization Status | Naturalized |
| Industry | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth Country | Finland |
| Birthplace (normalized) | finland |
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 Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Nelson
Spouse · 1940 · age 59 · b. ~1881 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00187-00106)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Beverly Olsen | 10 | Daughter | — | Calif |
| 42 | Theresa Olsen | 65 | Mother | — | Calif |
| 43 | Mary A. Rocha | 65 | Head | — | Calif |
| 44 | Florence Rocha | 38 | Daughter | — | Calif |
| 45 | Joseph Rocha | 34 | Son | Draftsman | Calif |
| 46 | Albert Rocha | 32 | Son | Truck Driver | Calif |
| 47 | Adiel G. Olson | 62 | Head | Carpenter | Sweden |
| 48 | Annie Olson | 52 | Wife | — | Calif |
| 49 | Ralph B. Olson | 29 | Son | Deliveryman | Calif |
| 50 | Robert A. Olson | 20 | Son | Physical Trainer | Calif |
| 51 | Francis E. Hanson | 42 | Head | Mattress Maker | Calif |
| 52 | Abbie Hanson | 22 | Wife | Seamstress | Alabama |
| 53 | Warren Hanson | 16 | Son | — | Calif |
| 54 | Ronald Hanson | 9 | Son | — | Calif |
| 55 | Julius B. Roth | 61 | Head | Street Car Operator | Germany |
| 56 | Elizabeth Roth | 54 | Wife | — | Sweden |
| 57 | Alice Roth | 31 | Daughter | — | Calif |
| 58 | Hazel Roth | 29 | Daughter | Stenographer | Calif |
| 59 | John Nelson | 62 | Head | Railroad Pensioner | Sweden |
| 60 | Mary Nelson THIS PERSON | 59 | Wife | — | Finland |
| 61 | John Jr. Nelson | 29 | Son | Diesel Engineer | Calif |
| 62 | Dorothy Nelson | 28 | Daughter-in-law | — | Utah |
| 63 | John F. Meyer | 77 | Head | Carpenter | Germany |
| 64 | Margaret Meyer | 68 | Wife | — | N. Y. |
| 65 | John J. Meyer | 43 | Head | Machinist | Calif |
| 66 | Helen Meyer | 43 | Wife | — | Wis. |
| 67 | Fred J. Meyer | 18 | Son | — | Calif |
| 68 | Raymond Meyer | 13 | Son | — | Calif |
| 69 | Angelo Ogliaro | 58 | Head | Maintenance Man | Italy |
| 70 | Madelena Ogliaro | 52 | Wife | Cannery Worker | Italy |
| 71 | Rose Ogliaro | 16 | Daughter | — | Calif |
| 72 | Mary Ogliaro | 15 | Daughter | — | Calif |
| 73 | Katherine Perkono | 56 | Head | — | Italy |
| 74 | Alphonso Perkono | 24 | Son | Boilermaker | Calif |
| 75 | Tony Abundes | 43 | Head | Laborer | Mexico |
| 76 | Petra Abundes | 47 | Wife | — | Mexico |
| 77 | John Creamer | 34 | Head | Bar Tender | Nebraska |
| 78 | Mildred Creamer | 30 | Wife | — | Nebraska |
| 79 | Betty J. Creamer | 11 | Daughter | — | Calif |
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)