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Harold Allen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Harold Allen across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 10-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Allen |
| Given Name | Harold |
| 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 | 7 |
| 1935 Residence | Same town |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Ivory Allen | Head | — | 51 | ~1889 |
| Ruth Allen | Daughter | — | 11 | ~1929 |
| Helen Allen | Daughter | — | 5 | ~1935 |
| Harold Allen | Son | — | 15 | ~1925 |
| Robert Allen | Son | — | 7 | ~1933 |
| Helen Allen | Spouse | — | 31 | ~1909 |
| John Allen | Son | — | 13 | ~1927 |
| Daniel Allen | Son | — | 9 | ~1931 |
| Edmund Allen | Son | — | 8 | ~1932 |
| Ivory Allen | Son | — | 3 | ~1937 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 4
Middlesex, Massachusetts · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Allen |
| Given Name | Harold W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | New York |
| 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 — 10 household members
| Surname | Allen |
| Given Name | Harold |
| 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 | 7 |
| 1935 Residence | Same town |
| 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 Harold Allen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Harold Allen
Son · 1940 · age 15 · b. ~1925 · Massachusetts
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Sibling
Daniel Allen
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ivory Allen
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Allen
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edmund Allen
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Allen
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Allen
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Allen
Sibling · 1940 · age 7
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
38 people indexed on this census page (nara:1940:m-t0627-01612-00892)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles W. Chisholm | 45 | Head | Buyer | Canada-English |
| 2 | Margaret F. Chisholm | 42 | Wife | — | Massachusetts |
| 3 | Charles W. Chisholm | 15 | Son | — | Massachusetts |
| 4 | Donald F. Chisholm | 11 | Son | — | Massachusetts |
| 5 | Angelo Bacchi | 39 | Head | Laborer | Italy |
| 6 | Nora Bacchi | 35 | Wife | — | Italy |
| 7 | Joseph Bacchi | 17 | Son | — | Massachusetts |
| 8 | James J. Brooks | 70 | Head | Foreman-Labor | Massachusetts |
| 9 | Anna F. Brooks | 59 | Wife | — | Massachusetts |
| 11 | Ivory Allen | 51 | Head | Yard Master | Maine |
| 12 | Helen Allen | 31 | Wife | — | Scotland-English |
| 13 | Harold Allen THIS PERSON | 15 | Son | — | Massachusetts |
| 14 | John Allen | 13 | Son | — | Massachusetts |
| 15 | Ruth Allen | 11 | Daughter | — | Massachusetts |
| 16 | Daniel Allen | 9 | Son | — | Massachusetts |
| 17 | Edmund Allen | 8 | Son | — | Massachusetts |
| 18 | Robert Allen | 7 | Son | — | Massachusetts |
| 19 | Helen Allen | 5 | Daughter | — | Massachusetts |
| 20 | Ivory Allen | 3 | Son | — | Massachusetts |
| 21 | Hans Hanson | 65 | Head | — | Denmark |
| 22 | Audrey Rose Hanson | 54 | Housekeeper | Housekeeper | England |
| 23 | Edwin F. Bower | 35 | Head | Statistician | Massachusetts |
| 24 | Doris A. Bower | 36 | Wife | — | Massachusetts |
| 25 | Wayne F. Bower | 1 | Son | — | Massachusetts |
| 26 | Harold F. Colan | 40 | Head | Florist | Massachusetts |
| 27 | Alice J. Colan | 37 | Wife | Registered Nurse | Massachusetts |
| 28 | Harold F. Colan | 7 | Son | — | Massachusetts |
| 30 | George Cavanaugh | 26 | Head | Crane Man | Massachusetts |
| 31 | Alice M. Cavanaugh | 25 | Wife | — | Massachusetts |
| 32 | John J. Cavanaugh | 6 | Son | — | Massachusetts |
| 33 | Robert E. Cavanaugh | 5 | Son | — | Massachusetts |
| 34 | Paul W. Cavanaugh | 2 | Son | — | Massachusetts |
| 35 | George D. Forsyth | 56 | Head | Plate Engraver | Northern Ireland |
| 36 | Alice M. Forsyth | 51 | Wife | — | Massachusetts |
| 37 | Frank Forsyth | 18 | Son | Last Maker | Massachusetts |
| 38 | Doris Forsyth | 17 | Daughter | — | Massachusetts |
| 39 | Elmer R. Forsyth | 15 | Son | — | Massachusetts |
| 40 | Ernest W. Seiffert | 25 | Son-in-law | Metal Worker | Massachusetts |
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)