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Mary Mcmillan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Yellowstone, Montana
Our Model Tree links this Mary Mcmillan across the 1930 and 1940 US Censuses in Yellowstone, Montana (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 10-person household.
Age 4
b. ~1926
Female
Daughter
Born: Montana
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Yellowstone, Montana |
| Surname | McMillan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Additional Details | |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Township / Ward | School Dist No 52 |
| Est. Birth Year | ~1926 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ethel Mcmillan | Daughter | — | 15 | ~1915 |
| William Mcmillan | Son | — | 21 | ~1909 |
| Mary Mcmillan | Spouse | — | 42 | ~1888 |
| George Mcmillan | Son | — | 24 | ~1906 |
| Edith Mcmillan | Daughter | — | 17 | ~1913 |
| Leonard Mcmillan | Son | — | 7 | ~1923 |
| Mary Mcmillan | Daughter | — | 4 | ~1926 |
| Ira Mcmillan | Son | — | 19 | ~1911 |
| William Mcmillan | Head | — | 53 | ~1877 |
| Dunham Mcmillan | Son | — | 13 | ~1917 |
Census Appearances
1930
Yellowstone, Montana
Daughter, age 4
Yellowstone, Montana · implied b. ~1926 — 10 household members
| Surname | McMillan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Yellowstone-County, Montana
Daughter, age 13
Yellowstone-County, Montana · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMillen |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | School District 2 - Last Block Nos. |
| 1935 Residence (County) | Yellowstone |
| Highest Grade | 7 |
| 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 Mary Mcmillan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcmillan
Daughter · 1930 · age 4 · b. ~1926 · Montana
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Sibling
Ira Mcmillan
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ethel Mcmillan
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcmillan
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mcmillan
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dunham Mcmillan
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edith Mcmillan
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Mcmillan
Sibling · 1930 · age 7
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
1930 US Federal Census — Yellowstone, Montana
Open full size
1930 US Federal Census — Yellowstone, Montana
Page Contents
50 people indexed on this census page (ia:1930:15thcensus1264unit:1034)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donald Shearer | 16 | Head | Farmer | Montana |
| 2 | Sylvia Shearer | 17 | Sister | — | Montana |
| 3 | Alberta Shearer | 10 | Sister | — | Montana |
| 4 | Emil C. Grebel | 48 | Head | Farmer | Nebraska |
| 5 | Ida E. Grebel | 47 | Wife | — | Nebraska |
| 6 | Winona M. Grebel | 20 | Daughter | — | Nebraska |
| 7 | Maynard B. Grebel | 19 | Son | Laborer | Montana |
| 8 | Leonard C. Grebel | 16 | Daughter | — | Montana |
| 9 | Josephine A. Grebel | 9 | Daughter | — | Montana |
| 10 | William J. Mcmillan | 53 | Head | Farmer | Missouri |
| 11 | Mary M. Mcmillan | 42 | Wife | — | Missouri |
| 12 | George J. Mcmillan | 24 | Son | Farm Laborer | Montana |
| 13 | William J. Mcmillan | 21 | Son | Farm Laborer | Montana |
| 14 | Ira B. Mcmillan | 19 | Son | Farm Laborer | Montana |
| 15 | Edith P. Mcmillan | 17 | Daughter | — | Montana |
| 16 | Ethel M. Mcmillan | 15 | Daughter | — | Montana |
| 17 | Dunham Mcmillan | 13 | Son | — | Montana |
| 18 | Leonard A. Mcmillan | 7 | Son | — | Wyoming |
| 19 | Mary E. Mcmillan THIS PERSON | 4 | Daughter | — | Montana |
| 20 | Amaziah Janier | 53 | Head | Farmer | Illinois |
| 21 | Mary Janier | 52 | Wife | — | Illinois |
| 22 | George Janier | 17 | Son | — | Montana |
| 23 | Luis Mota | 40 | Head | Farm Laborer | Mexico |
| 24 | Remedios Mota | 39 | Wife | — | Mexico |
| 25 | Arthur Engle | 54 | Head | — | Ohio |
| 26 | Alice Engle | 53 | Wife | — | Illinois |
| 27 | Clark Engle | 27 | Son | Farmer | Illinois |
| 28 | Beatrice Engle | 24 | Daughter | — | Illinois |
| 29 | Joseph Bululj | 42 | Head | Farmer | Jugoslavia |
| 30 | Pearl Bululj | 32 | Wife | — | Jugoslavia |
| 31 | Angeline Bululj | 12 | Daughter | — | Montana |
| 32 | Mike Bululj | 10 | Son | — | Montana |
| 33 | Joe Bululj | 7 | Son | — | Montana |
| 34 | Mildred Bululj | 5 | Daughter | — | Montana |
| 35 | Ruby V. Bululj | 3 | Daughter | — | Montana |
| 36 | Marjorie S. Bululj | 1 | Daughter | — | Montana |
| 37 | Fred Shock | 33 | Head | Farmer | Illinois |
| 38 | Henrietta Shock | 29 | Wife | — | New York |
| 39 | Robert H. Shock | 4 | Son | — | Montana |
| 40 | Mary K. Shock | 2 | Daughter | — | Montana |
| 41 | Fred L. Shock | 1 | Son | — | Montana |
| 42 | Edward Shock | 21 | Brother | Baker | Illinois |
| 43 | James R. Lanner | 37 | Head | Farmer | Wyoming |
| 44 | Evelyn Lanner | 25 | Wife | Teacher | Colorado |
| 45 | Fred Brown | 27 | Head | Farmer | Colorado |
| 46 | Dan Brown | 20 | Brother | Farm Laborer | South Dakota |
| 47 | Martha Brown | 17 | Sister | — | South Dakota |
| 48 | John A. Morgan | 57 | Head | Dairyman | New York |
| 49 | Florence Morgan | 41 | Wife | — | Nebraska |
| 50 | Karla Jane Morgan | 2 | Daughter | — | Kansas |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)