MC
Mary Costello — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Los Angeles, California
Our Model Tree links this Mary Costello across the 1920, 1930 and 1940 US Censuses in Los Angeles, California (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 2-person household.
Age 48
b. ~1872
Female
Head
Born: Missouri
Widowed
1920 Census Record Details
| Census Year | 1920 |
| Location | Los Angeles, California |
| Surname | Costello |
| Given Name | Mary F |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Father's Birthplace | United States |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Venice City |
| Est. Birth Year | ~1872 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Costello | Daughter | — | 17 | ~1903 |
| Mary Costello | Head | — | 48 | ~1872 |
Census Appearances
1920
Los Angeles, …
Head, age 48
Los Angeles, California · implied b. ~1872 — 2 household members
| Surname | Costello |
| Given Name | Mary F |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Father's Birthplace | United States |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Los Angeles, …
Head, age 61
Los Angeles, California · implied b. ~1869
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Castello |
| Given Name | Mary F |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | United States |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | $50 |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Los-Angeles-County, California
Head, age 67
Los-Angeles-County, California · implied b. ~1873
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Castello |
| Given Name | Mary C. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Widowed |
| Birthplace | Missouri |
| 1935 Residence (City) | Los Angeles city |
| 1935 Residence (County) | Los Angeles |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Costello across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Costello
Head · 1920 · age 48 · b. ~1872 · California
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Los Angeles, California
Open full size
1920 US Federal Census — Los Angeles, California
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu120unit:0191)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | William E Jones | 52 | Head | Retired | Wales |
| 52 | Julia F Jones | 49 | Wife | — | Vermont |
| 53 | Sherman Murray | 76 | Head | Retired | Germany |
| 54 | Rachel Murray | 67 | Wife | — | Mississippi |
| 55 | Ellwood F Jones | 31 | Head | Office Manager | Michigan |
| 56 | Bess M Jones | 32 | Wife | — | Indiana |
| 57 | Mary F Costello THIS PERSON | 48 | Head | — | Missouri |
| 58 | Marguerite M Costello | 17 | Daughter | — | Colorado |
| 59 | William F Windholz | 50 | Head | Manager Office | California |
| 60 | Anastasia Windholz | 41 | Wife | — | California |
| 61 | Arthur Maxson | 29 | Head | Musician | Wisconsin |
| 62 | Vivian Maxson | 27 | Wife | — | California |
| 63 | Clemence A Renard | 53 | Head | — | Missouri |
| 64 | Delia Renard | 74 | Mother | — | Missouri |
| 65 | Henry F Miller | 41 | Head | Chemist | New York |
| 66 | Edythe M Miller | 27 | Wife | — | Indiana |
| 67 | Harry W Chase | 76 | Head | Farmer | Kansas |
| 68 | Minnie M Chase | 48 | Wife | — | Kansas |
| 69 | Gladys Chase | 17 | Daughter | — | California |
| 70 | Isadore E Johnson | 52 | Head | Retired | Connecticut |
| 71 | Ray P Johnson | 49 | Wife | — | California |
| 72 | Otto L Pratt | 53 | Head | Proprietor Dept. | Iowa |
| 73 | Martha O Pratt | 52 | Wife | — | Massachusetts |
| 74 | Olive B Pratt | 22 | Daughter | — | Massachusetts |
| 75 | Joseph E Storton | 58 | Head | Salesman | Wisconsin |
| 76 | May Storton | 51 | Wife | Housekeeper | Wisconsin |
| 77 | Frank A Stevens | 36 | Head | Mechanical Engineer | Ohio |
| 78 | Ariadne B Stevens | 34 | Wife | — | Ohio |
| 79 | Kathleen V Stevens | 7 | Daughter | — | California |
| 80 | Frank A Jr Stevens | 4 | Son | — | California |
| 81 | Robert E Stevens | 2 | Son | — | California |
| 82 | Caroline Strawberry | 54 | Mother-in-law | — | Ohio |
| 83 | Charles Watts | 53 | Head | Manager | England |
| 84 | Margaret M Sullivan | 71 | Head | — | Wisconsin |
| 85 | Arthur H Mueller | 11 | Grandson | — | Montana |
| 86 | Shirley Harris | 10 | Grand-Daughter | — | Montana |
| 87 | Charles G Mueller | 24 | Grandson | — | Montana |
| 88 | Margaret May | 30 | Nurse | Nurse | Minnesota |
| 89 | Paul B Davidson | 24 | Head | Contractor | Ohio |
| 90 | Grace R Davidson | 24 | Wife | — | Colorado |
| 91 | Arthur Davidson | 6 | Son | — | California |
| 92 | King Davidson | 4 | Son | — | California |
| 93 | R George Wilson | 32 | Head | Traffic Manager | Canada |
| 94 | Ethel J Wilson | 32 | Wife | — | Ohio |
| 95 | Jack C Wilson | 10 | Son | — | California |
| 96 | Ruth G Wilson | 8 | Daughter | — | California |
| 97 | Frank S Rice | 33 | Head | Salesman | Minnesota |
| 98 | Madeline Rice | 21 | Wife | — | Alabama |
| 99 | Frank S Jr Rice | 3 | Son | — | California |
| 100 | Martha B Rice | 51 | Mother | Saleslady | Minnesota |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)