WP
Walter Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Walter Peterson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Fred & Ida — first a son (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Peterson |
| Given Name | Walter |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Clerk |
| Industry | Liberty Mutual Ins |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Medford City |
| Est. Birth Year | ~1915 |
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 Walter | Age | Birth yr |
|---|---|---|---|---|
| Virginia Peterson | Daughter | — | 23 | ~1917 |
| Ida Peterson | Head | — | 60 | ~1880 |
| Walter Peterson | Son | — | 25 | ~1915 |
| Catherine Peterson | Daughter | — | 20 | ~1920 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 5
Middlesex, Massachusetts · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Walter |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 15
Middlesex, Massachusetts · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Walter R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 4 household members
| Surname | Peterson |
| Given Name | Walter |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | Clerk |
| Industry | Liberty Mutual Ins |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1300 |
| Highest Grade | H 4 |
| 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 Walter Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Fred Peterson (~0.92 confidence) and mother Ida Peterson (~0.92 confidence) and mother Ida Peterson (~0.92 confidence) and mother Ida Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Peterson
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Ida Peterson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Ida Peterson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Ida Peterson
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Walter Peterson
Son · 1940 · age 25 · b. ~1915 · Massachusetts
★ You are viewing this record
Sibling
Virginia Peterson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Peterson
Sibling · 1940 · age 20
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-t0627-01611-00104)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Baxter John Earl | 2 | Son | — | Massachusetts |
| 42 | William Maccormack | 63 | Head | Carpenter | Massachusetts |
| 43 | Catherine Maccormack | 58 | Wife | — | Eire |
| 44 | Frances Maccormack | 21 | Daughter | — | Massachusetts |
| 45 | Ida Peterson | 60 | Head | — | Sweden |
| 46 | Walter Peterson THIS PERSON | 25 | Son | Clerk | Massachusetts |
| 47 | Virginia Peterson | 23 | Daughter | Clerk | Massachusetts |
| 48 | Catherine Peterson | 20 | Daughter | Clerk | Massachusetts |
| 49 | Arthur S Wheeldon | 41 | Head | Clerk | Massachusetts |
| 50 | Berna Wheeldon | 37 | Wife | — | Massachusetts |
| 51 | John Wheeldon | 16 | Son | — | Massachusetts |
| 52 | James Mcshane | 49 | Head | Cutter | Massachusetts |
| 53 | Mary Mcshane | 46 | Wife | — | Massachusetts |
| 54 | Claire Mcshane | 22 | Daughter | Clerk | Massachusetts |
| 55 | Irene Mcshane | 18 | Daughter | — | Massachusetts |
| 56 | John Cumberland | 31 | Head | Manager | Massachusetts |
| 57 | Mary Cumberland | 30 | Wife | — | Massachusetts |
| 58 | John Corner | 58 | Head | Sheet Metal | Massachusetts |
| 59 | Alice Corner | 56 | Wife | — | Massachusetts |
| 60 | Hannah Noonan | 60 | Head | — | Massachusetts |
| 61 | Henry Noonan | 40 | Son | Carrier | Massachusetts |
| 62 | Alice Noonan | 35 | Daughter | Clerk | Massachusetts |
| 63 | William Merrill | 50 | Head | Clerk | New York |
| 64 | Mary Merrill | 53 | Wife | — | Massachusetts |
| 65 | William Jr Merrill | 24 | Son | — | Massachusetts |
| 66 | William Mitchell | 41 | Head | Salesman | Massachusetts |
| 67 | Regina Mitchell | 43 | Wife | — | Massachusetts |
| 68 | John R Mitchell | 16 | Son | — | Massachusetts |
| 69 | Robert Mitchell | 13 | Son | — | Massachusetts |
| 70 | Raymond Mitchell | 7 | Son | — | Massachusetts |
| 71 | Mary Mitchell | 81 | Mother | — | Massachusetts |
| 72 | Leonard Bowler | 63 | Head | — | Canada English |
| 73 | Joseph Hickey | 47 | Head | Salesman | Massachusetts |
| 74 | Elizabeth Hickey | 45 | Wife | — | Massachusetts |
| 75 | Robert Hickey | 17 | Son | — | Massachusetts |
| 76 | Elizabeth Hickey | 15 | Daughter | — | Massachusetts |
| 77 | Charles Hickey | 11 | Son | — | Massachusetts |
| 78 | Richard Hickey | 8 | Son | — | Massachusetts |
| 79 | Charles Thomas | 33 | Head | City Driver | Massachusetts |
| 80 | Mabel Thomas | 32 | Wife | — | Massachusetts |
Pedigree Summary
Walter + 2 siblings
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)