MC
Mary Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Chester-County, Pennsylvania
Our Model Tree links this Mary Connolly across the 1930 and 1940 US Censuses in Chester-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Chester-County, Pennsylvania |
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (County) | Chester |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Penna. |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | West Whiteland Twp |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Patricia Connolly | Daughter | — | 8 | ~1932 |
| John Connolly | Son | — | 7 | ~1933 |
| Margaret Connolly | Daughter | — | 10 | ~1930 |
| Catherine Connolly | Daughter | — | 9 | ~1931 |
| Brian Connolly | Son | — | 1 | ~1939 |
| Mary Connolly | Daughter | — | 12 | ~1928 |
| Donald Connolly | Son | — | 5 | ~1935 |
| Catherine Connolly | Spouse | — | 37 | ~1903 |
| Daniel Connolly | Head | — | 39 | ~1901 |
Census Appearances
1930
Chester, Pennsylvania
Daughter, age 2
Chester, Pennsylvania · implied b. ~1928 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Chester-County, Pennsylvania
Daughter, age 12
Chester-County, Pennsylvania · implied b. ~1928 — 9 household members
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (County) | Chester |
| Highest Grade | 6 |
| 1935 Residence | Penna. |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 12 · b. ~1928 · Pennsylvania
★ You are viewing this record
Sibling
Margaret Connolly
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Connolly
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Connolly
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Brian Connolly
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Connolly
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Connolly
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 — Chester-County, Pennsylvania
Open full size
1940 US Federal Census — Chester-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03467-00964)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary C. Mccauley | 2 | daughter | — | Pennsylvania |
| 2 | Daniel H. Connolly | 39 | Head | Truck Driver | Northern Ireland |
| 3 | Catherine Connolly | 37 | Wife | — | Northern Ireland |
| 4 | Mary Connolly THIS PERSON | 12 | daughter | — | Pennsylvania |
| 5 | Margaret Connolly | 10 | daughter | — | Pennsylvania |
| 6 | Catherine Connolly | 9 | daughter | — | Pennsylvania |
| 7 | Patricia Connolly | 8 | daughter | — | Pennsylvania |
| 8 | John Connolly | 7 | son | — | Pennsylvania |
| 9 | Donald Connolly | 5 | son | — | Pennsylvania |
| 10 | Brian Connolly | 1 | son | — | Pennsylvania |
| 11 | Samuel P. Frazier | 56 | Head | Line Patrolman | Virginia |
| 12 | Esther Frazier | 46 | Wife | — | Virginia |
| 13 | Ellis R. Speakman | 24 | Head | 56 | Pennsylvania |
| 14 | Ruth H. Speakman | 27 | Wife | — | North Carolina |
| 15 | Joan H. Speakman | 5 | daughter | — | Pennsylvania |
| 16 | William L. Rogers | 72 | Head | Farmer | Pennsylvania |
| 17 | Lavina H. D. Rogers | 69 | Wife | — | Pennsylvania |
| 18 | Lucy H. Coburn | 64 | Sister-in-law | — | Pennsylvania |
| 19 | Charles H. Morton | 63 | Head | Farmer | Pennsylvania |
| 20 | Ethel P. Morton | 50 | Wife | — | Pennsylvania |
| 21 | John B. Morton | 15 | son | — | Pennsylvania |
| 22 | Alfred P. Morton | 13 | son | — | Pennsylvania |
| 23 | C. Anita Morton | 12 | daughter | — | Pennsylvania |
| 24 | Richard C. Morton | 10 | son | — | Pennsylvania |
| 25 | Frances E. Morton | 9 | daughter | — | Pennsylvania |
| 26 | William H. Hopkins | 92 | Head | — | Pennsylvania |
| 27 | Ida F. Hopkins | 78 | wife | — | Pennsylvania |
| 28 | Charles Chandler | 55 | nephew | Farm Laborer | Virginia |
| 29 | David J. Sr. Hunter | 47 | Head | Farmer | Pennsylvania |
| 30 | Elizabeth R. Hunter | 44 | wife | — | Pennsylvania |
| 31 | David J. Jr. Hunter | 27 | son | Product Delivery Clerk | Pennsylvania |
| 32 | Lewis A. Hunter | 23 | son | Laborer | Pennsylvania |
| 33 | Robert H. Al. Hunter | 18 | son | Laborer | Pennsylvania |
| 34 | Mary Elizabeth Hunter | 11 | daughter | — | Pennsylvania |
| 35 | D. Philip Hunter | 8 | son | — | Pennsylvania |
| 36 | Jacob G. Miller | 48 | Head | 84 | Pennsylvania |
| 37 | Clara M. Miller | 39 | wife | — | Pennsylvania |
| 38 | William E. Parker | 76 | Head | Farmer | Pennsylvania |
| 39 | Isabel Parker | 52 | wife | — | Pennsylvania |
| 40 | Brinton Smith | 26 | Head | 69 | 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)