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Mary Baird — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Boulder, Colorado
Our Model Tree links this Mary Baird across the 1920 and 1930 US Censuses in Boulder, Colorado (XGBoost, ~Confirmed) — first a daughter (b.~1909), then head of a 8-person household.
Age 21
b. ~1909
Female
Daughter
Born: Colorado
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Boulder, Colorado |
| Surname | Baird |
| Given Name | Mary D |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Occupation | Waitress |
| Industry | Cafe |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Waitress |
| Township / Ward | Boulder |
| Est. Birth Year | ~1909 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Benjamin Baird | Son | — | 18 | ~1912 |
| Homer Baird | Son | — | 7 | ~1923 |
| Maud Baird | Spouse | — | 48 | ~1882 |
| Elizabeth Baird | Daughter | — | 12 | ~1918 |
| Mary Baird | Daughter | — | 21 | ~1909 |
| Newton Baird | Head | — | 50 | ~1880 |
| Janice Baird | Daughter | — | 27 | ~1903 |
| Adelaide Baird | Daughter | — | 19 | ~1911 |
Census Appearances
1920
Boulder, Colorado
Daughter, age 12
Boulder, Colorado · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Baird |
| Given Name | Mary D |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Boulder, Colorado
Daughter, age 21
Boulder, Colorado · implied b. ~1909 — 8 household members
| Surname | Baird |
| Given Name | Mary D |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Waitress |
| Industry | Cafe |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Baird across 2 US Census years (1920 and 1930) in Boulder, Colorado, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Baird
Daughter · 1930 · age 21 · b. ~1909 · Colorado
★ You are viewing this record
Sibling
Elizabeth Baird
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Baird
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adelaide Baird
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janice Baird
Sibling · 1930 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Homer Baird
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 — Boulder, Colorado
Open full size
1930 US Federal Census — Boulder, Colorado
Page Contents
50 people indexed on this census page (ia:1930:15thcensus231unit:0221)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Mook Mabel A Mock | 51 | Wife | — | Nebraska |
| 52 | Oscar Huddleston | 58 | Head | Missionary | Virginia |
| 53 | Leona Huddleston | 54 | Wife | — | Ohio |
| 54 | Loris L Huddleston | 20 | Daughter | — | Philippine Island |
| 55 | Virginia Huddleston | 16 | Daughter | — | Philippine Island |
| 56 | Walter H Echols | 59 | Head | Teacher | Texas |
| 57 | Ethel H Echols | 47 | Wife | — | Texas |
| 58 | Mary E Echols | 16 | Daughter | — | Oklahoma |
| 59 | Nancy A Echols | 9 | Daughter | — | Oklahoma |
| 60 | Geneva Echols | 4 | Daughter | — | Colorado |
| 61 | Robert E Lewis | 41 | Head | Repairman | Kansas |
| 62 | Pearl H Lewis | 26 | Wife | — | Kansas |
| 63 | Hazel P Lewis | 4 | Daughter | — | Kansas |
| 64 | Arthur G Lewis | 1 | Son | — | Colorado |
| 65 | Zelda Piddington | 21 | Sister-in-law | Servant | Kansas |
| 66 | William H Sisson | 83 | Head | — | Michigan |
| 67 | Nancy L Sisson | 45 | Wife | — | Georgia |
| 68 | Lawrence O'Lee M Sisson | 18 | Step-daughter | — | Georgia |
| 69 | Eliza Swartz | 73 | Head | — | Indiana |
| 70 | Carrie G Smith | 75 | Head | — | Illinois |
| 71 | Newton H Baird | 50 | Head | Mechanic | Illinois |
| 72 | Maud S Baird | 48 | Wife | — | Illinois |
| 73 | Janice L Baird | 27 | Daughter | Saleslady | Illinois |
| 74 | Mary D Baird THIS PERSON | 21 | Daughter | Waitress | Colorado |
| 75 | Adelaide P Baird | 19 | Daughter | Waitress | Colorado |
| 76 | Benjamin C Baird | 18 | Son | — | Colorado |
| 77 | Elizabeth F Baird | 12 | Daughter | — | Colorado |
| 78 | Homer N Baird | 7 | Son | — | Colorado |
| 79 | William Mcgill | 60 | Head | Teamster | Penn |
| 80 | Cora Mcgill | 43 | Wife | — | Kansas |
| 81 | Charles A Mcgill | 23 | Son | Laborer | Colorado |
| 82 | Robert L Mcgill | 18 | Son | Laborer | Colorado |
| 83 | Margaret F Mcgill | 13 | Daughter | — | Colorado |
| 84 | Annabelle Mcgill | 11 | Daughter | — | Colorado |
| 85 | John H Mcgill | 9 | Son | — | Colorado |
| 86 | Richard F Mcgill | 7 | Son | — | Colorado |
| 87 | Ralph L Mcgill | 5 | Son | — | Colorado |
| 88 | Florence A Murphy | 75 | Head | — | Indiana |
| 89 | Onan P Boutrolis | 77 | Head | — | Illinois |
| 90 | Margaret J Boutrolis | 79 | Wife | — | Minnesota |
| 91 | George L Schroeder | 44 | Head | Engineer | Illinois |
| 92 | Elinor S Schroeder | 41 | Wife | — | Colorado |
| 93 | Edna M Schroeder | 18 | Daughter | — | Colorado |
| 94 | Sherly M Schroeder | 13 | Daughter | — | Colorado |
| 95 | Fred Russo | 42 | Head | Laborer | Italy |
| 96 | Mary Russo | 32 | Wife | — | Italy |
| 97 | Peter Russo | 6 | Son | — | Colorado |
| 98 | Alfred Russo | 5 | Son | — | Colorado |
| 99 | Timothy L Russo | 3 | Son | — | Colorado |
| 100 | Rose K Russo | 2 | Daughter | — | Colorado |
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)