MK
Mary Keenan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marin-County, California
Our Model Tree links this Mary Keenan across the 1930 and 1940 US Censuses in Marin-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marin-County, California |
| Surname | Keenan |
| Given Name | Mary Jane |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Route 1 |
| 1935 Residence (County) | Marin |
| Additional Details | |
| Highest Grade | S 5 |
| 1935 Residence | Same house |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Route 1 |
| Est. Birth Year | ~1928 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| June Keenan | Daughter | — | 9 | ~1931 |
| Edith Keenan | Spouse | — | 29 | ~1911 |
| James Keenan | Head | — | 39 | ~1901 |
| John Keenan | Son | — | 8 | ~1932 |
| Mary Keenan | Daughter | — | 12 | ~1928 |
| Catherine Keenan | Daughter | — | ~1940 |
Census Appearances
1930
Marin, California
Daughter, age 2
Marin, California · implied b. ~1928 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keenan |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | North Ireland |
| Mother's Birthplace | California |
| Occupation | none |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Marin-County, California
Daughter, age 12
Marin-County, California · implied b. ~1928 — 6 household members
| Surname | Keenan |
| Given Name | Mary Jane |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Route 1 |
| 1935 Residence (County) | Marin |
| Highest Grade | S 5 |
| 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 Keenan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Keenan
Daughter · 1940 · age 12 · b. ~1928 · California
★ You are viewing this record
Sibling
John Keenan
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Keenan
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
June Keenan
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Marin-County, California
Open full size
1940 US Federal Census — Marin-County, California
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-00262-00660)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Keenan | 39 | Head | Laborer | Ireland |
| 42 | Edith (X) Keenan | 29 | Wife | — | California |
| 43 | Mary Jane Keenan THIS PERSON | 12 | daughter | — | California |
| 44 | June Keenan | 9 | daughter | — | California |
| 45 | John Keenan | 8 | son | — | California |
| 46 | Catherine Keenan | 0 | daughter | — | California |
| 47 | Adam Senior | 60 | Head | Carpenter | Canada Eng. |
| 48 | Jessie Senior | 56 | Wife | — | Scotland |
| 49 | Bruno Penz | 54 | Head | Picker | Germany |
| 50 | Martha (X) Penz | 53 | Wife | — | Germany |
| 51 | Patrick (X) Kane | 66 | Head | — | Ireland |
| 52 | William Mibach | 35 | Head | Clerk | California |
| 53 | Phyllis (X) Mibach | 31 | Wife | — | Utah |
| 54 | Patricia Mibach | 11 | daughter | — | California |
| 55 | Marin Perry | 28 | Head | Mechanic | California |
| 56 | Christine (X) Perry | 24 | Wife | — | Nova Scotia |
| 57 | Marlene Perry | 1 | daughter | — | California |
| 58 | Edward (X) Meyer | 34 | Head | Welder | Wisconsin |
| 59 | Mildred Meyer | 34 | Wife | Bookkeeper | South Dakota |
| 60 | Hazel (X) Nelson | 37 | Head | — | Missouri |
| 61 | Wilbur Mulcahy | 27 | Head | Contractor | California |
| 62 | Mary (X) Mulcahy | 27 | Wife | — | Arizona |
| 63 | Kathleen Mulcahy | 3 | daughter | — | California |
| 64 | Delia O'Neill | 53 | Head | Nurse | Ireland |
| 65 | Harold Mefford | 46 | Head | Mechanic | California |
| 66 | Francis (X) Mefford | 46 | Wife | — | Indiana |
| 67 | Lenora Mefford | 18 | daughter | Presser | California |
| 68 | Harold Mefford | 13 | son | — | California |
| 69 | Eugene (X) Meyer | 34 | Head | Manager | California |
| 70 | Harriet Meyer | 34 | Wife | — | West Virginia |
| 71 | Lee Jordan | 39 | Head | Washer | Oregon |
| 72 | Louise Jordan | 34 | Wife | — | Hawaii |
| 73 | Bill (X) Atkinson | 15 | Step-son | — | California |
| 74 | Molf | Wolf Bremer | 27 | Head | Laborer | California |
| 75 | Isabelle Bremer | 36 | Wife | — | California |
| 76 | Barton Ramsey | 71 | Head | — | Pennsylvania |
| 77 | Laura (X) Ramsey | 48 | daughter | — | Pennsylvania |
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)