JR
John Reardon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Reardon across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 8-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Reardon |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Medford City |
| Est. Birth Year | ~1925 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Jeremiah Reardon | Head | — | 36 | ~1904 |
| John Reardon | Son | — | 15 | ~1925 |
| Geraldine Reardon | Daughter | — | 2 | ~1938 |
| Elsie Reardon | Spouse | — | 33 | ~1907 |
| Joseph Reardon | Son | — | 1 | ~1939 |
| Evelyn Reardon | Daughter | — | 15 | ~1925 |
| Richard Reardon | Son | — | ~1940 | |
| Jean Reardon | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 5
Suffolk, Massachusetts · implied b. ~1925 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Reardon |
| Given Name | John P |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 15
Middlesex-County, Massachusetts · implied b. ~1925 — 8 household members
| Surname | Reardon |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 5 |
| 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 John Reardon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Reardon
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Geraldine Reardon
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Reardon
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Reardon
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Reardon
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Reardon
Sibling · 1940 · age 12
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 — 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-t0627-01611-00226)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Wilbur E. Babcock | 46 | Head | Foreman | Massachusetts |
| 2 | Florence P. Babcock | 46 | Wife | — | Massachusetts |
| 3 | George W. Babcock | 27 | Son | Salesman | Massachusetts |
| 4 | Hazel M. Watts | 25 | Daughter | Saleswoman | Massachusetts |
| 5 | John H. 2Nd Watts | 5 | Grandson | — | Massachusetts |
| 6 | Clarence P. Robinson | 43 | Head | Superintendent | Massachusetts |
| 7 | Clarice L. Robinson | 36 | Wife | — | Connecticut |
| 8 | Stanley L. Robinson | 14 | Son | — | Massachusetts |
| 9 | Donald R. Robinson | 12 | Son | — | Massachusetts |
| 10 | Richard Robinson | 8 | Son | — | Massachusetts |
| 11 | Sarah Bush | 69 | Mother | — | Canada-English |
| 12 | James H. Clancy | 44 | Head | Stenographer | Massachusetts |
| 13 | Mary F. Clancy | 43 | Wife | — | Massachusetts |
| 14 | William E. Tobin | 54 | Head | Chief Repairman | Massachusetts |
| 15 | Nora M. Tobin | 58 | Wife | — | Maine |
| 16 | Harold J. Johnson | 47 | Head | Trucker | California |
| 17 | Elsie C. Johnson | 45 | Wife | — | Canada-English |
| 18 | Kenneth B. Johnson | 18 | Son | — | Massachusetts |
| 19 | Harry E. Cleveland | 61 | Head | — | Illinois |
| 20 | Edith H. Cleveland | 45 | Wife | — | Massachusetts |
| 21 | Elizabeth J. Cleveland | 19 | Daughter | — | Massachusetts |
| 22 | Waldo L. Waters | 28 | Head | Drafting Engineer | Massachusetts |
| 23 | Armande R. Waters | 31 | Wife | Machine Operator | Maine |
| 24 | Ella M. Waters | 60 | Mother | Manager | Massachusetts |
| 25 | — | None | — | — | — |
| 26 | Harry A. Lacy | 41 | Head | Rubber Worker | Newfoundland |
| 27 | Jessie Lacy | 34 | Wife | — | Newfoundland |
| 28 | Dorothy E. Lacy | 16 | Daughter | — | Massachusetts |
| 29 | George E. Lacy | 14 | Son | — | Massachusetts |
| 30 | Jeanette Lacy | 11 | Daughter | — | Massachusetts |
| 31 | Milton L. Lacy | 8 | Son | — | Massachusetts |
| 32 | Jeremiah Reardon | 36 | Head | Chauffeur | Eire |
| 33 | Elsie M. Reardon | 33 | Wife | — | Canada-English |
| 34 | Evelyn A. Reardon | 15 | Daughter | — | Massachusetts |
| 35 | John P. Reardon THIS PERSON | 15 | Son | — | Massachusetts |
| 36 | Jean F. Reardon | 12 | Daughter | — | Massachusetts |
| 37 | Geraldine Reardon | 2 | Daughter | — | Massachusetts |
| 38 | Joseph P. Reardon | 1 | Son | — | Massachusetts |
| 39 | Richard Reardon | 0 | Son | — | Massachusetts |
| 40 | Alexander Grenfield | 53 | Head | Laborer | Eire |
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)