JC
John Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Connolly across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1890), then head of a 4-person household.
Age 50
b. ~1890
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Connolly |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Massachusetts |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Laborer |
| Industry | First National Stores |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1560 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Laborer |
| Township / Ward | Medford City |
| Est. Birth Year | ~1890 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Raymond Connolly | Son | — | 25 | ~1915 |
| John Connolly | Head | — | 50 | ~1890 |
| Mary Yiravac | Spouse | — | 55 | ~1885 |
| Arthur Connolly | Son | — | 22 | ~1918 |
Census Appearances
1920
Suffolk, Massachusetts
Other, age 31
Suffolk, Massachusetts · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connolly |
| Given Name | John |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Fireman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Year of Naturalization | 1917 |
| Birthplace (normalized) | ireland |
Head, age 41
Middlesex, Massachusetts · implied b. ~1889 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connelly |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1901 |
| Age at First Marriage | 21 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Engineer |
| Industry | Street |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 5000 |
| Radio Set | R |
| Veteran | no |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Middlesex-County, Massachusetts
Head, age 50
Middlesex-County, Massachusetts · implied b. ~1890 — 4 household members
| Surname | Connolly |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Massachusetts |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Laborer |
| Industry | First National Stores |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1560 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 John Connolly across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Connolly
Head · 1940 · age 50 · b. ~1890 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01611-00130)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Greene | 56 | Head | Clerk | Massachusetts |
| 42 | James H. Greene | 32 | Son | Clerk | Massachusetts |
| 43 | Jeannette Greene | 24 | Daughter | Registered Nurse | Massachusetts |
| 44 | Grace G. Greene | 16 | Daughter | — | Massachusetts |
| 45 | Helen Castellano | 35 | Daughter | Stenographer | Massachusetts |
| 46 | Grace Castellano | 48 | Wife | — | Massachusetts |
| 47 | Michael Castellano | 56 | Head | Salesman | Italy |
| 48 | Theresa Castellano | 29 | Daughter | Saleslady | Massachusetts |
| 49 | Pauline Castellano | 20 | Daughter | — | Massachusetts |
| 50 | Ethel M. O'Hare | 36 | Wife | — | Massachusetts |
| 51 | John F. O'Hare | 44 | Head | Manager | Massachusetts |
| 52 | Barbara O'Hare | 11 | Daughter | — | Massachusetts |
| 53 | John P. O'Hare | 8 | Son | — | Massachusetts |
| 54 | Dorothy O'Hare | 5 | Daughter | — | Massachusetts |
| 55 | Annie O'Hare | 75 | Mother | — | England |
| 56 | Theresa Connolly | 19 | Daughter | — | Malden |
| 57 | Nellie Connolly | 59 | Wife | — | England |
| 58 | John Connolly THIS PERSON | 50 | Head | Laborer | Ireland |
| 59 | Raymond Connolly | 25 | Son | Laborer | Massachusetts |
| 60 | Arthur Connolly | 22 | Son | — | Massachusetts |
| 61 | Mary Yiravac | 55 | Wife | — | Massachusetts |
| 62 | Anthony J. Yiravac | 65 | Head | — | Bohemia |
| 63 | Mary E. Supple | 56 | Wife | Sewing | Newfoundland |
| 64 | Dora M. Lane | 48 | Wife | — | Massachusetts |
| 65 | Frank A. Lane | 53 | Head | Manager | Massachusetts |
| 66 | Annie Langley | 68 | Mother | — | Massachusetts |
| 67 | Margaret Quinn | 52 | Wife | — | Massachusetts |
| 68 | John S. Quinn | 51 | Head | Plumber | Ireland |
| 69 | John Quinn | 22 | Son | School Teacher | Massachusetts |
| 70 | Donald Quinn | 18 | Son | Plumber'S Helper | Massachusetts |
| 71 | Elizabeth Butler | 33 | Wife | — | Massachusetts |
| 72 | William Butler | 42 | Head | Claims Investigator | Massachusetts |
| 73 | Alfred Butler | 5 | Son | — | Massachusetts |
| 74 | Robert Mcleod | 28 | Head | Clerk | Massachusetts |
| 75 | Florence Mcleod | 28 | Wife | Clerk | Massachusetts |
| 76 | Florence Rooney | 48 | Wife | — | Massachusetts |
| 77 | James P. Rooney | 49 | Head | Forman | Massachusetts |
| 78 | Paul Rooney | 23 | Son | Clerk | Massachusetts |
| 79 | Robert Rooney | 17 | Son | — | Massachusetts |
| 80 | Muriel Rooney | 36 | Wife | — | Massachusetts |
Related Census Records
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)