MJ
Mary Jensen — 1930 US Census Record
Linked across censuses1930 United States Federal Census · San Francisco, California
Our Model Tree links this Mary Jensen across the 1920, 1930 and 1940 US Censuses in San Francisco, California (XGBoost, ~Confirmed) — first a spouse (b.~1869), then head of a 3-person household.
Age 61
b. ~1869
Female
Spouse
Born: California
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | San Francisco, California |
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1869 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alice Jensen | Daughter | — | 32 | ~1898 |
| Charles Jensen | Head | — | 65 | ~1865 |
| Mary Jensen | Spouse | — | 61 | ~1869 |
Census Appearances
1920
San Francisco, …
Spouse, age 50
San Francisco, California · implied b. ~1870 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Spouse, age 61
San Francisco, California · implied b. ~1869 — 3 household members
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Spouse, age 72
San-Francisco-County, California · implied b. ~1868 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jansen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 72 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Highest Grade | G 8 |
| 1935 Residence | Same house |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Jensen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jensen
Spouse · 1930 · age 61 · b. ~1869 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — San Francisco, California
Open full size
1930 US Federal Census — San Francisco, California
Page Contents
50 people indexed on this census page (ia:1930:californiacensus00reel201:0887)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry S Lowkar | 27 | Head | Barber | Greece |
| 2 | Florence M Lowkar | 26 | Wife | — | Utah |
| 3 | Charles Jensen | 65 | Head | Warehouseman | Denmark |
| 4 | Mary Jensen THIS PERSON | 61 | Wife | — | California |
| 5 | Alice Jensen | 32 | Daughter | — | California |
| 6 | Anne E Mickson | 58 | Head | Stationery | New York |
| 7 | Edith Mickson | 31 | Daughter | Saleswoman | California |
| 8 | Lottie Sommerfield | 54 | Sister | — | New York |
| 9 | George Kuhls | 42 | Head | Salesman | Maryland |
| 10 | Margaret E Kuhls | 32 | Wife | — | California |
| 11 | Marjorie E Kuhls | 2 | Daughter | — | California |
| 12 | Seth Leach | 51 | Head | — | West Virginia |
| 13 | Anna Leach | 47 | Wife | — | Russia |
| 14 | Seth Leach | 17 | Son | Trucker | New York |
| 15 | Rose Leach | 15 | Daughter | — | New York |
| 16 | Helen Leach | 13 | Daughter | — | New York |
| 17 | James Donnelly | 33 | Head | Fireman | California |
| 18 | Sadie E Donnelly | 22 | Wife | — | Oregon |
| 19 | John E Donnelly | 1 | Son | — | California |
| 20 | Leo G Donnelly | 0 | Son | — | California |
| 21 | Harry Luckmann | 40 | Head | Executive | California |
| 22 | Mary Luckmann | 23 | Wife | — | Germany |
| 23 | Edward S Madden | 35 | Head | Mariner | Washington |
| 24 | Edith S Madden | 31 | Wife | Bookkeeper | California |
| 25 | Edward S Madden | 2 | Son | — | California |
| 26 | August Pierre | 52 | Head | Servant | Sweden |
| 27 | Agnes Pierre | 52 | Wife | Maid | England |
| 28 | Agnes Pierre | 24 | Daughter | — | England |
| 29 | Cornelius Mccarthy | 57 | Head | Railway Mail Clerk | Ireland Free State |
| 30 | Annie Mccarthy | 51 | Wife | — | Ireland Free State |
| 31 | Florence Mccarthy | 24 | Daughter | Store Clerk | California |
| 32 | Elaine Mccarthy | 21 | Daughter | Office Clerk | California |
| 33 | Maria Ward | 62 | Head | — | Ireland Free State |
| 34 | Mary E Ward | 33 | Daughter | Bookkeeper | California |
| 35 | James Ward | 31 | Son | Metal Worker | California |
| 36 | Frances Ward | 26 | Daughter | Clerical Work | California |
| 37 | Rose A Ward | 24 | Daughter | Clerical Work | California |
| 38 | Frank Newberry | 50 | Head | Salesman | California |
| 39 | Marie Newberry | 48 | Wife | — | California |
| 40 | Joe Newberry | 17 | Son | — | California |
| 41 | Patricia Newberry | 5 | Daughter | — | California |
| 42 | John J Christian | 37 | Head | Watchmaker | Missouri |
| 43 | Helen Christian | 34 | Wife | — | Missouri |
| 44 | Anne M Christian | 60 | Mother | — | Missouri |
| 45 | Edward Abraham | 43 | Head | Educational Director | Iowa |
| 46 | Frances Abraham | 36 | Wife | — | Texas |
| 47 | Frances E Abraham | 11 | Daughter | — | Oregon |
| 48 | Edward Abraham | 2 | Son | — | Texas |
| 49 | Patricia Abraham | 1 | Daughter | — | California |
| 50 | Frank Lynch | 44 | Head | Watchman | Canada English |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)