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Leonard Anderson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Leonard Anderson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Leo & Leo — first a head (b.~1911), then head of a 4-person household.
Age 29
b. ~1911
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Anderson |
| Given Name | Leonard |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Janitor |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 9 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Janitor |
| Township / Ward | Belmont |
| Est. Birth Year | ~1911 |
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 Leonard | Age | Birth yr |
|---|---|---|---|---|
| Doris Anderson | Daughter | — | 2 | ~1938 |
| Leonard Anderson | Head | — | 29 | ~1911 |
| Hilda Anderson | Spouse | — | 34 | ~1906 |
| Phyllis Anderson | Daughter | — | 8 | ~1932 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 9
Suffolk, Massachusetts · implied b. ~1911 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Anderson |
| Given Name | Leo |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 19
Suffolk, Massachusetts · implied b. ~1911 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Anderson |
| Given Name | Leo R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Stock boy |
| Industry | Electric Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 29
Middlesex-County, Massachusetts · implied b. ~1911 — 4 household members
| Surname | Anderson |
| Given Name | Leonard |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Belmont |
| 1935 Residence (County) | Middlesex |
| Occupation | Janitor |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 9 |
| 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 Leonard Anderson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Leo Anderson (~0.92 confidence) and father Leo Anderson (~0.92 confidence) and mother Margaret Anderson (~0.92 confidence) and mother Margaret Anderson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Leo Anderson
b. ~1891
Source father
● Household
· direct · ~0.92
Father
Leo Anderson
b. ~1891
Source father
● Household
· direct · ~0.92
Mother
Margaret Anderson
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Margaret Anderson
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Leonard Anderson
Head · 1940 · age 29 · b. ~1911 · 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-t0627-01603-00220)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Domenica Anastasi | 60 | Wife | — | Italy |
| 42 | Emily Anastasi | 26 | Daughter | Operator | Massachusetts |
| 43 | Ernest Thomas | 39 | Head | Steamfitter | Massachusetts |
| 44 | Catherine Thomas | 37 | Wife | — | Massachusetts |
| 45 | Marion Thomas | 14 | Daughter | — | Massachusetts |
| 46 | Doris Thomas | 10 | Daughter | — | Massachusetts |
| 47 | Arakie Harry | 61 | Head | — | Armenia |
| 48 | Sarkis Vartanian | 33 | Son-in-law | Clerk | Armenia |
| 49 | Mary Vartanian | 30 | Daughter | — | Massachusetts |
| 50 | Paul Vartanian | 1 | Grand-son | — | Massachusetts |
| 51 | Leonard Anderson THIS PERSON | 29 | Head | Janitor | Massachusetts |
| 52 | Hilda Anderson | 34 | Wife | — | Massachusetts |
| 53 | Phyllis Anderson | 8 | Daughter | — | Massachusetts |
| 54 | Doris Anderson | 2 | Daughter | — | Massachusetts |
| 55 | Frederick Wilmarth | 67 | Head | Electrician | Massachusetts |
| 56 | Sarah Wilmarth | 64 | Wife | — | Massachusetts |
| 57 | Caroline Johnson | 60 | Head | Cutter | Sweden |
| 58 | Anna Johnson | 21 | Daughter | Clerk | Massachusetts |
| 59 | Elpidio Baia | 42 | Head | Laborer | Italy |
| 60 | Josephine Baia | 31 | Wife | — | Italy |
| 61 | Paul Baia | 11 | Son | — | Massachusetts |
| 62 | Joseph Baia | 9 | Son | — | Massachusetts |
| 63 | John Baia | 6 | Son | — | Massachusetts |
| 64 | Rosario Quinta | 36 | Head | Laborer | Italy |
| 65 | Jennie Quinta | 33 | Wife | — | Italy |
| 66 | Josephine Quinta | 11 | Daughter | — | Massachusetts |
| 67 | Anna Quinta | 10 | Daughter | — | Massachusetts |
| 68 | Lisace Quinta | 3 | Daughter | — | Massachusetts |
| 69 | Michael O'Sullivan | 41 | Head | Laborer | Irish Free State |
| 70 | Margaret O'Sullivan | 39 | Wife | — | Irish Free State |
| 71 | Eileen O'Sullivan | 15 | Daughter | — | Massachusetts |
| 72 | Constantino Machetta | 44 | Head | Painter | Massachusetts |
| 73 | Gertrude Machetta | 25 | Wife | Operator | Massachusetts |
| 74 | Richard Machetta | 1 | Son | — | Massachusetts |
| 75 | Alice Rouse | 52 | Head | House Keeper | England |
| 76 | Arthur Rouse | 22 | Son | Truck Driver | Massachusetts |
| 77 | William J. Long | 35 | Head | Laborer | Massachusetts |
| 78 | Helen Long | 32 | Wife | — | Massachusetts |
| 79 | William 3Rd Long | 11 | Son | — | Massachusetts |
| 80 | Richard Long | 11 | Son | — | Massachusetts |
Pedigree Summary
Leonard
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)