WC
Walter Campbell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Silver-Bow-County, Montana
Our Model Tree links this Walter Campbell across the 1920, 1930 and 1940 US Censuses in Silver-Bow-County, Montana (XGBoost, ~Confirmed), with identified parents Duncan & Martha — first a son (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Silver-Bow-County, Montana |
| Surname | Campbell |
| Given Name | Walter |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Butte |
| 1935 Residence (County) | Silver Bow |
| Additional Details | |
| Class of Worker | 120 |
| Hours Worked | 0 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Township / Ward | Butte |
| Est. Birth Year | ~1920 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Walter | Age | Birth yr |
|---|---|---|---|---|
| Walter Campbell | Son | — | 20 | ~1920 |
| Thomas Campbell | Son | — | 17 | ~1923 |
| Martha Campbell | Spouse | — | 54 | ~1886 |
| Duncan Campbell | Head | — | 57 | ~1883 |
| Duncan Campbell | Son | — | 21 | ~1919 |
| William Campbell | Son | — | 15 | ~1925 |
Census Appearances
1920
Silver Bow, …
Son, age
Silver Bow, Montana · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Walter J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Michigan |
| Mother's Birthplace | New York |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Silver Bow, …
Son, age 10
Silver Bow, Montana · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Walter H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Michigan |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Silver-Bow-County, Montana
Son, age 20
Silver-Bow-County, Montana · implied b. ~1920 — 6 household members
| Surname | Campbell |
| Given Name | Walter |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Butte |
| 1935 Residence (County) | Silver Bow |
| Class of Worker | 120 |
| Hours Worked | 0 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Duncan Campbell (~0.92 confidence) and mother Martha Campbell (~0.92 confidence) and mother Martha Campbell (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Duncan Campbell
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Martha Campbell
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Martha Campbell
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Walter Campbell
Son · 1940 · age 20 · b. ~1920 · Montana
★ You are viewing this record
Sibling
Duncan Campbell
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Campbell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Campbell
Sibling · 1940 · age 15
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 — Silver-Bow-County, Montana
Open full size
1940 US Federal Census — Silver-Bow-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02231-00220)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bee D. O'Rourke | 59 | Head | — | Northern Ireland |
| 42 | James O'Rourke | 29 | Son | Pipe-Man | Colorado |
| 43 | Georgina Castro | 45 | Head | Hand-Ironer | Montana |
| 44 | Eugene Callahan | 35 | Head | Miner | Montana |
| 45 | Evelyn Callahan | 26 | Wife | — | Montana |
| 46 | Mary Louise Callahan | 5 | Daughter | — | Montana |
| 47 | Jerry Allen Callahan | 3 | Son | — | Montana |
| 48 | Nathan Callahan | 23 | Brother | Miner | Montana |
| 49 | Betty Callahan | 14 | Sister | — | Montana |
| 50 | Harry Robinson | 45 | Head | Coffee Roaster | Minnesota |
| 51 | Hazel Robinson | 35 | Wife | — | Nebraska |
| 52 | Larry Robinson | 7 | Son | — | Montana |
| 53 | Thomas Robinson | 1 | Son | — | Montana |
| 54 | Jessie Campbell | 63 | Head | — | — |
| 55 | Drucilla Lewis | 79 | Head | — | Arkansas |
| 56 | John Richter | 50 | Head | Laborer | Missouri |
| 57 | Pete Rice | 85 | Roomer | — | Kentucky |
| 58 | William Mendenhall | 45 | Head | Manager | Missouri |
| 59 | Bertha Mendenhall | 46 | Wife | — | Illinois |
| 60 | Beryl Mendenhall | 16 | Daughter | — | Montana |
| 61 | Louise Boundy | 49 | Head | Cook | England |
| 62 | Fred Boundy | 22 | Son | Clerk | Montana |
| 63 | Enid Boundy | 18 | Daughter | Clerk | Montana |
| 64 | Daniel E. Williams | 47 | Head | Blacksmith | Montana |
| 65 | Ready Williams | 36 | Wife | — | Montana |
| 66 | Edward Williams | 10 | Son | — | Montana |
| 67 | Claire Williams | 8 | Daughter | — | Montana |
| 68 | Donald Williams | 6 | Son | — | Montana |
| 69 | Duncan Campbell | 57 | Head | Office Worker | Michigan |
| 70 | Martha Campbell | 54 | Wife | — | New York |
| 71 | Duncan, Jr. Campbell | 21 | Son | — | Montana |
| 72 | Walter Campbell THIS PERSON | 20 | Son | — | Montana |
| 73 | William Campbell | 15 | Son | — | Oregon |
| 74 | Thomas Campbell | 17 | Son | — | Montana |
| 75 | Lawrence Jones | 55 | Head | Clergyman | Pennsylvania |
| 76 | Mamie X. Jones | 47 | Wife | — | Illinois |
| 77 | Nelson Jones | 19 | Son | Truck-Driver | Iowa |
| 78 | Madeline Jones | 13 | Daughter | — | Montana |
| 79 | Winifred Jones | 11 | Daughter | — | Montana |
| 80 | James Davidson | 69 | Head | City Superintendent | Missouri |
Pedigree Summary
Walter + 3 siblings
Gen 1 · 3 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)