MC
Mary Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Connolly across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 11-person household.
Age 17
b. ~1923
Female
Daughter
Born: Texas
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Texas |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Additional Details | |
| Industry | S |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Texas |
| Birth Country | United States |
| Birthplace (normalized) | texas |
| Township / Ward | Los Angeles |
| Est. Birth Year | ~1923 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Patrick Connolly | Son | — | 7 | ~1933 |
| Kathleen Connolly | Daughter | — | 19 | ~1921 |
| Jack Connolly | Son | — | 23 | ~1917 |
| Margaret Connolly | Daughter | — | 15 | ~1925 |
| Julia Connolly | Daughter | — | 21 | ~1919 |
| Julia Connolly | Spouse | — | 50 | ~1890 |
| Thomas Connolly | Son | — | 20 | ~1920 |
| Mary Connolly | Daughter | — | 17 | ~1923 |
| Ann Connolly | Daughter | — | 9 | ~1931 |
| James Connolly | Head | — | 52 | ~1888 |
| Frank Connolly | Son | — | 14 | ~1926 |
Census Appearances
1930
Los Angeles, …
Daughter, age 7
Los Angeles, California · implied b. ~1923 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Texas |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Texas |
| Birth Country | United States |
| Birthplace (normalized) | texas |
1940
Los-Angeles-County, California
Daughter, age 17
Los-Angeles-County, California · implied b. ~1923 — 11 household members
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Texas |
| 1935 Residence (City) | Los Angeles |
| 1935 Residence (County) | Los Angeles |
| Industry | S |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Texas |
| Birth Country | United States |
| Birthplace (normalized) | texas |
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 Connolly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connolly
Daughter · 1940 · age 17 · b. ~1923 · California
★ You are viewing this record
Sibling
Julia Connolly
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Connolly
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Connolly
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Connolly
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Connolly
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Connolly
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jack Connolly
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Connolly
Sibling · 1940 · age 14
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 — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00426-00023)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Irene Kennedy | 20 | daughter | Laborer | North Dakota |
| 42 | Ray Kennedy | 17 | son | Laborer | North Dakota |
| 43 | Lucille Nelson | 25 | lodger | Nurse | Minnesota |
| 44 | Arthur D. Tucker | 49 | head | Painter | Ohio |
| 45 | Bessie Tucker | 45 | wife | — | Ohio |
| 46 | Kenneth Tucker | 17 | son | Laborer | California |
| 47 | Leo D. Anstatt | 30 | head | Collector | Texas |
| 48 | Geraldine Anstatt | 20 | wife | — | Iowa |
| 49 | Alfred M. Coats | 55 | head | Mechanic | New York |
| 50 | Nellie Coats | 56 | wife | — | Oregon |
| 51 | Alfred Jr. Coats | 17 | son | — | California |
| 52 | Raymond P. Colville | 40 | head | Clerk | Illinois |
| 53 | Madeline J. Colville | 35 | wife | — | Washington |
| 54 | John R. Colville | 12 | son | — | California |
| 55 | Mercedes Montoya | 53 | head | — | New Mexico |
| 56 | Reginald Montoya | 30 | son | Salesman | New Mexico |
| 57 | Minnie Montoya | 28 | daughter | Operator | New Mexico |
| 58 | Arthur Montoya | 25 | son | Laborer | New Mexico |
| 59 | Michael Kreins | 79 | head | — | Iowa |
| 60 | Onnie Rautlo | 31 | lodger | Carpenter | Minnesota |
| 61 | Albert D. Jenkins | 38 | head | Butcher | Washington |
| 62 | Katherine Jenkins | 48 | wife | — | Kansas |
| 63 | Clifton E. Stanley | 34 | head | Auditor | California |
| 64 | Grace N. Stanley | 27 | wife | — | Arkansas |
| 65 | Clifton C. Jr. Stanley | 3 | son | — | California |
| 66 | Wayne Stanley | 1 | son | — | California |
| 67 | James Connolly | 52 | head | Sign Painter | Ireland |
| 68 | Julia Connolly | 50 | wife | — | Pennsylvania |
| 69 | Jack Connolly | 23 | son | Messenger | Minnesota |
| 70 | Julia Connolly | 21 | daughter | Clerk | Texas |
| 71 | Thomas Connolly | 20 | son | Painter | Texas |
| 72 | Kathleen Connolly | 19 | daughter | Saleslady | Texas |
| 73 | Mary Connolly THIS PERSON | 17 | daughter | — | Texas |
| 74 | Margaret Connolly | 15 | daughter | — | California |
| 75 | Frank Connolly | 14 | son | — | California |
| 76 | Ann Connolly | 9 | daughter | — | California |
| 77 | Patrick Connolly | 7 | son | — | California |
| 78 | Claude Kausin | 26 | head | Silversmith | Utah |
| 79 | Paul Vollenbach | 24 | lodger | Assemblyman | Pennsylvania |
| 80 | Alfred Foth | 27 | lodger | Machinist | 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)