MC
Mary Conroy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Conroy across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 7-person household.
Age 11
b. ~1919
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Conroy |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1919 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Conroy | Spouse | — | 37 | ~1893 |
| Robert Conroy | Son | — | 8 | ~1922 |
| James Conroy | Head | — | 37 | ~1893 |
| Mary Conroy | Daughter | — | 11 | ~1919 |
| James Conroy | Son | — | 10 | ~1920 |
| Paul Conroy | Son | — | 5 | ~1925 |
| Dorothy Conroy | Daughter | — | 7 | ~1923 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 11
Middlesex, Massachusetts · implied b. ~1919 — 7 household members
| Surname | Conroy |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 20
Middlesex-County, Massachusetts · implied b. ~1920 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conroy |
| Given Name | Margaret C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | New Worker |
| Hours Worked | 40 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Conroy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Conroy
Daughter · 1930 · age 11 · b. ~1919 · Massachusetts
★ You are viewing this record
Sibling
Paul Conroy
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Conroy
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Conroy
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Conroy
Sibling · 1930 · age 8
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:15thcensuspopula917unit:0558)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | David A Safford | 54 | Head | — | Canada French |
| 2 | Irene Safford | 54 | Wife | — | Massachusetts |
| 3 | Arthur A Safford | 25 | Son | Salesman | Massachusetts |
| 4 | Alice G Safford | 23 | Daughter | — | Massachusetts |
| 5 | Minnie C Hamilton | 58 | Wife | Saleswoman | Massachusetts |
| 6 | Eriel L Hamilton | 27 | Son | — | Canada English |
| 7 | Donald S Hamilton | 23 | Son | — | Massachusetts |
| 8 | James A Conroy | 37 | Head | Dealer | Massachusetts |
| 9 | Mary A Conroy | 37 | Wife | — | Massachusetts |
| 10 | Mary J Conroy THIS PERSON | 11 | Daughter | — | Massachusetts |
| 11 | James J Conroy | 10 | Son | — | Massachusetts |
| 12 | Robert E Conroy | 8 | Son | — | Massachusetts |
| 13 | Dorothy Conroy | 7 | Daughter | — | Massachusetts |
| 14 | Paul J Conroy | 5 | Son | — | Massachusetts |
| 15 | James T O'Connor | 50 | Head | Manager | Massachusetts |
| 16 | Delia A O'Connor | 45 | Wife | — | Canada English |
| 17 | William J O'Connor | 22 | Son | Printer | Massachusetts |
| 18 | William Allard | 45 | Boarder | Chauffeur | New Hampshire |
| 19 | James J Morris | 25 | Son | Chauffeur | Massachusetts |
| 20 | John J Foley | 70 | Head | Janitor | Ireland |
| 21 | Mary E Foley | 65 | Wife | — | Canada English |
| 22 | Ellen Tracy | 70 | Sister | — | Ireland |
| 23 | William Bender | 47 | Head | Miller | Massachusetts |
| 24 | Margaret Bender | 47 | Wife | — | Ireland |
| 25 | Charles J Mulligan | 45 | Head | Salesman | Massachusetts |
| 26 | Mary E Mulligan | 43 | Wife | — | Massachusetts |
| 27 | Charles J Jr Mulligan | 15 | Son | Salesman | Massachusetts |
| 28 | William Mulligan | 14 | Son | Helper | Massachusetts |
| 29 | William Dorman | 37 | Head | Fireman | Massachusetts |
| 30 | Jean F Dorman | 31 | Wife | — | Canada English |
| 31 | Irene G Dorman | 8 | Daughter | — | Massachusetts |
| 32 | Mary Clancy | 43 | Boarder | — | Canada English |
| 33 | Gertrude Gately | 19 | Niece | Teacher | Massachusetts |
| 34 | William Murnan | 60 | Head | Coachman | Massachusetts |
| 35 | Mary Murnan | 60 | Wife | — | Massachusetts |
| 36 | Harold W Murnan | 24 | Son | Engineer | Massachusetts |
| 37 | Joseph Crosby | 50 | Head | — | Canada English |
| 38 | Elizabeth Crosby | 48 | Wife | Chauffeur | Massachusetts |
| 39 | Richard A Crosby | 22 | Son | Salesman | Massachusetts |
| 40 | Jessie A Crosby | 20 | Daughter | Clerk | Massachusetts |
| 41 | Daniel J Mcmahon | 45 | Head | Clerk | Massachusetts |
| 42 | Catherine Mcmahon | 45 | Wife | — | Ireland |
| 43 | Daniel J Jr Mcmahon | 17 | Son | — | Massachusetts |
| 44 | Robert Mcmahon | 15 | Son | — | Massachusetts |
| 45 | John Mcmahon | 11 | Son | — | Massachusetts |
| 46 | Leonard Mullen | 50 | Head | Janitor | Massachusetts |
| 47 | Charlotte Mullen | 50 | Wife | — | Massachusetts |
| 48 | Leonard Jr Mullen | 21 | Son | Clerk | Massachusetts |
| 49 | Mary E Mullen | 18 | Daughter | Teacher | Massachusetts |
| 50 | John Mullen | 15 | Son | — | Massachusetts |
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)