WM
William Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Silver-Bow-County, Montana
Our Model Tree links this William Mccarthy across the 1920, 1930 and 1940 US Censuses in Silver-Bow-County, Montana (XGBoost, ~Confirmed), with identified parents Susan & Johanna — first a son (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Son
Born: New Hampshire
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Silver-Bow-County, Montana |
| Surname | McCarthy |
| Given Name | William M |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Butte |
| 1935 Residence (County) | Silver Bow |
| Additional Details | |
| Occupation | Clerk |
| Industry | Social Security |
| Class of Worker | PW |
| Hours Worked | 13 |
| Income (1939) | 200 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Occupation | Clerk |
| Township / Ward | Butte |
| Est. Birth Year | ~1913 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Katherine Mccarthy | Daughter | — | 40 | ~1900 |
| Johanna Mccarthy | Head | — | 70 | ~1870 |
| John Mccarthy | Other | — | 31 | ~1909 |
| William Mccarthy | Son | — | 27 | ~1913 |
Census Appearances
1920
Silver Bow, …
Son, age 8
Silver Bow, Montana · implied b. ~1912 — 17 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1930
Silver Bow, …
Son, age 18
Silver Bow, Montana · implied b. ~1912 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | William M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Silver-Bow-County, Montana
Son, age 27
Silver-Bow-County, Montana · implied b. ~1913 — 4 household members
| Surname | McCarthy |
| Given Name | William M |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Butte |
| 1935 Residence (County) | Silver Bow |
| Occupation | Clerk |
| Industry | Social Security |
| Class of Worker | PW |
| Hours Worked | 13 |
| Income (1939) | 200 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
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 William Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Susan Mccarthy (~0.92 confidence) and mother Johanna Mccarthy (~0.92 confidence) and mother Johanna Mccarthy (~0.92 confidence) and mother Brownie Carter (~0.60 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.84
Mother
Susan Mccarthy
b. ~1866
Source mother
● Household
· direct · ~0.92
Mother
Johanna Mccarthy
b. ~1868
Source mother
● Household
· direct · ~0.92
Mother
Johanna Mccarthy
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Brownie Carter
b. ~1903
Source mother
● Household
· direct · ~0.6
This person
Anchor record
William Mccarthy
Son · 1940 · age 27 · b. ~1913 · Montana
★ You are viewing this record
Sibling
Katherine Mccarthy
Sibling · 1940 · age 40
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-t0627-02230-00153)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Johanna Mccarthy | 70 | Head | — | Eire |
| 42 | Katherine Mccarthy | 40 | daughter | Operator | Michigan |
| 43 | William M Mccarthy THIS PERSON | 27 | son | Clerk | New Hampshire |
| 44 | John B Mccarthy | 31 | nephew | — | Montana |
| 45 | Edward F Connors | 38 | Head | Carpenter | Montana |
| 46 | Helen Connors | 36 | Wife | — | Montana |
| 47 | Mary Lou Connors | 17 | daughter | — | Montana |
| 48 | Jack Connors | 15 | Son | — | Montana |
| 49 | Billy Connors | 13 | Son | — | Montana |
| 50 | Tommy Connors | 11 | Son | — | Montana |
| 51 | Bobby Connors | 10 | Son | — | Montana |
| 52 | Patsy Ann Connors | 8 | daughter | — | Montana |
| 53 | Eva Burns | 48 | Head | — | Montana |
| 54 | George Burns | 22 | son | Clerk | Montana |
| 55 | Evelyn Burns | 15 | daughter | — | Montana |
| 56 | Julia Foley | 75 | Mother | — | Eire |
| 57 | Pat Foley | 43 | Brother | Carrier | Montana |
| 58 | Bruce R Sheppard | 59 | Head | Confectioner | Idaho |
| 59 | Lucy Sheppard | 53 | wife | — | Irish Free State |
| 60 | Bruce R Jr Sheppard | 21 | son | Confectioner | Washington |
| 61 | Gilbert Dubay | 46 | Head | Postal Clerk | Montana |
| 62 | Nellie Dubay | 50 | wife | — | Colorado |
| 63 | Frances Dubay | 21 | daughter | — | Montana |
| 64 | Nora Sullivan | 49 | Head | Bookbinding | Montana |
| 65 | James P Sullivan | 15 | son | — | Montana |
| 66 | Jean Ann Sullivan | 12 | daughter | — | Montana |
| 67 | Mattie Caughlin | 74 | Mother | — | Michigan |
| 68 | Tillie Olson | 74 | Head | — | Sweden |
| 69 | Sidney Ronald Mellow | 23 | Head | Typist-Filing Clerk | Montana |
| 70 | Martha O'Laughlin | 61 | Head | — | Michigan |
| 71 | Martha O'Laughlin | 30 | daughter | Teacher | Montana |
| 72 | Emil Fredrickson | 33 | Head | Glass Blower | S. Dakota |
| 73 | Mae Fredrickson | 30 | wife | — | England |
| 74 | Nora Murphy | 65 | Head | — | Eire |
| 75 | Elizabeth Murphy | 36 | daughter | Clerk | Montana |
| 76 | John Murphy | 34 | son | Claim Clerk | Montana |
| 77 | Elizabeth Roberts | 75 | Head | — | England |
| 78 | Corinda Roberts | 46 | daughter | — | Montana |
| 79 | Llewellyn Roberts | 30 | son | Bookkeeper | Montana |
| 80 | George Martin | 48 | Head | Miner | Poland |
Pedigree Summary
William + 1 sibling
Gen 1 · 4 parents
~0.84
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)