JM
John Mclean — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Mclean across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.
Age 60
b. ~1880
Male
Head
Born: Nova Scotia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McLean |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Nova Scotia |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Police officer |
| Industry | City |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 2072 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birthplace (normalized) | nova scotia |
| Occupation | Police Officer |
| Township / Ward | Medford City |
| Est. Birth Year | ~1880 |
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 |
|---|---|---|---|---|
| John Mclean | Head | — | 60 | ~1880 |
| John Mclean | Son | — | 30 | ~1910 |
| Robert Mclean | Son | — | 26 | ~1914 |
| Anna Mclean | Spouse | — | 61 | ~1879 |
Census Appearances
1920
Essex, Massachusetts
Head, age 37
Essex, Massachusetts · implied b. ~1883 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McLean |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Nova Scotia |
| Year of Immigration | 1899 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Nova Scotia |
| Mother's Birthplace | Nova Scotia |
| Occupation | Gardener |
| Industry | House |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birthplace (normalized) | nova scotia |
1930
Middlesex, Massachusetts
Head, age 48
Middlesex, Massachusetts · implied b. ~1882 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McLean |
| Given Name | John S |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Nova Scotia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1886 |
| Age at First Marriage | 24 |
| Father's Birthplace | Nova Scotia |
| Mother's Birthplace | Nova Scotia |
| Occupation | Painter |
| Industry | Painting |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Radio Set | R |
| Veteran | No |
| Birthplace (normalized) | nova scotia |
1940
Middlesex-County, Massachusetts
Head, age 60
Middlesex-County, Massachusetts · implied b. ~1880 — 4 household members
| Surname | McLean |
| Given Name | John R |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Nova Scotia |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Police officer |
| Industry | City |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 2072 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birthplace (normalized) | nova scotia |
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 Mclean across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
John Mclean
Head · 1940 · age 60 · b. ~1880 · 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
39 people indexed on this census page (nara:1940:m-t0627-01611-00048)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Theresa Kane | 38 | Wife | — | Nova Scotia |
| 42 | Barbara Kane | 7 | Daughter | — | Mass |
| 43 | Marilyn Kane | 4 | Daughter | — | Mass |
| 44 | John A Franklin | 41 | Head | Wood Worker | Nova Scotia |
| 45 | Helen V Franklin | 32 | Wife | — | Nova Scotia |
| 46 | Ester M Krupp | 51 | Head | Clerical | Mass |
| 47 | Bernard W Krupp | 27 | Son | Driver | Mass |
| 48 | Mary Krupp | 21 | Daughter | Book Keeper | Mass |
| 49 | John W Murray | 55 | Head | Operator | Canada |
| 50 | Ruby A Murray | 51 | Wife | — | Canada (Eng) |
| 51 | Ritchie Murray | 21 | Son | Salesman | Canada (Eng) |
| 52 | Lawrence J Murray | 20 | Son | New Worker | Mass |
| 53 | George Murray | 15 | Son | — | Mass |
| 54 | Joseph J O'Hearn | 29 | Head | Checker | Mass |
| 55 | Edith M O'Hearn | 26 | Wife | — | Mass |
| 56 | Joan E O'Hearn | 8 | Daughter | — | Mass |
| 57 | Marjorie O'Hearn | 6 | Daughter | — | Mass |
| 58 | John J O'Hearn | 61 | Father | Textile Printer | Irish Free State |
| 59 | Salvador Aguti | 39 | Head | Water Dept | Mass |
| 60 | Carmela Aguti | 35 | Wife | Lasting | Italy |
| 61 | Jeannette Aguti | 18 | Daughter | — | Mass |
| 62 | Joseph Aguti | 8 | Son | — | Mass |
| 63 | Amos P Knowlton | 30 | Head | Oil & Coal | Mass |
| 64 | Alice Knowlton | 36 | Wife | — | Newfoundland |
| 65 | Daniel J Connell | 54 | Head | Gas Maker | Irish Free State |
| 66 | Mary L Connell | 48 | Wife | — | Mass |
| 67 | Mary C Connell | 19 | Daughter | Typist | Mass |
| 68 | Dorothy Connell | 15 | Daughter | — | Mass |
| 69 | Eleanor Schwitter | 5 | Ward | — | Mass |
| 70 | Catherine Quinn | 4 | Ward | — | Mass |
| 71 | John R Mclean THIS PERSON | 60 | Head | Police Officer | Nova Scotia |
| 72 | Anna M Mclean | 61 | Wife | — | Nova Scotia |
| 73 | John N Mclean | 30 | Son | Clerical Work | Mass |
| 74 | Robert Mclean | 26 | Son | Packing | Mass |
| 75 | Oscar J Leclere | 61 | Head | Watchman | Canada (Fr) |
| 76 | Paula Leclere | 22 | Daughter | — | Mass |
| 78 | John W Morris | 57 | Head | Steam Fitter | Nova Scotia |
| 79 | Adeline G Morris | 51 | Wife | — | Nova Scotia |
| 80 | Sara R Morris | 25 | Daughter | Stenographer | Mass |
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)