MH
Mary Holland — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Polk, Iowa
Our Model Tree links this Mary Holland across the 1920 and 1930 US Censuses in Polk, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1894), then head of a 13-person household.
Age 36
b. ~1894
Female
Daughter
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Polk, Iowa |
| Surname | Holland |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Additional Details | |
| Occupation | Supervisor |
| Industry | Bell Telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Supervisor |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1894 |
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.
13 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Lynch | Daughter | — | 7 | ~1923 |
| Patricia Lynch | Daughter | — | 13 | ~1917 |
| Mary Holland | Daughter | — | 36 | ~1894 |
| Lavina Holland | Daughter | — | 25 | ~1905 |
| Harry Lynch | Head | — | 44 | ~1886 |
| Charles Shiel | Other | — | 38 | ~1892 |
| James Holland | Other | — | 65 | ~1865 |
| Paul Lynch | Son | — | 11 | ~1919 |
| Edward Holland | Son | — | 28 | ~1902 |
| Henry Lynch | Son | — | 9 | ~1921 |
| Martin Holland | Son | — | 22 | ~1908 |
| Catherine Lynch | Spouse | — | 40 | ~1890 |
| Lavina Holland | Spouse | — | 61 | ~1869 |
Census Appearances
1920
Polk, Iowa
Daughter, age 26
Polk, Iowa · implied b. ~1894 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Holland |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Occupation | Bookkeeper |
| Industry | Telephone Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Daughter, age 36
Polk, Iowa · implied b. ~1894 — 13 household members
| Surname | Holland |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | New York |
| Occupation | Supervisor |
| Industry | Bell Telephone |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Holland across 2 US Census years (1920 and 1930) in Polk, Iowa, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Holland
Daughter · 1930 · age 36 · b. ~1894 · Iowa
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Sibling
Patricia Lynch
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Lynch
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Holland
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Lynch
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lavina Holland
Sibling · 1930 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Lynch
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Holland
Sibling · 1930 · age 28
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 — Polk, Iowa
Open full size
1930 US Federal Census — Polk, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel675:0357)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William E Llewellyn | 32 | Head | Upholsterer | Missouri |
| 2 | Nellis P Llewellyn | 39 | Wife | None | Missouri |
| 3 | Aldo E Llewellyn | 9 | Son | None | Missouri |
| 4 | William R Llewellyn | 7 | Son | None | Missouri |
| 5 | Forrest C Stephens | 23 | Adp Son | Painter | Missouri |
| 6 | James Stephens | 7 | Adp Son | None | Missouri |
| 7 | George Casady | 28 | Son in law | Painter | Missouri |
| 8 | Opal Casady | 18 | Daughter | None | Missouri |
| 9 | Jean Casady | 2 | Daughter | None | Missouri |
| 10 | Jacob Isaacson | 53 | Head | Merchant | Russia |
| 11 | Ida Isaacson | 52 | Wife | None | Russia |
| 12 | Gertrude Isaacson | 26 | Daughter | Typist | Iowa |
| 13 | Lloyd Isaacson | 19 | Son | Salesman | Iowa |
| 14 | Dora Racey | 53 | Head | None | Iowa |
| 15 | Robert Racey | 27 | Son | Furniture Finisher | Iowa |
| 16 | Loraine Racey | 24 | Daughter | Cashier | Iowa |
| 17 | Philip Racey | 7 | Son | None | Iowa |
| 18 | Lorena Myers | 23 | Daughter | Saleslady | Iowa |
| 19 | Katherine Snyder | 5 | Daughter | None | Iowa |
| 20 | Bonnie Snyder | 4 | Daughter | None | Iowa |
| 21 | Rosemary Snyder | 2 | Daughter | None | Iowa |
| 22 | Harry P Lynch | 44 | Head | Plumber | Iowa |
| 23 | Catherine Lynch | 40 | Wife | None | Iowa |
| 24 | Patricia Lynch | 13 | Daughter | None | Iowa |
| 25 | Paul Lynch | 11 | Son | None | Iowa |
| 26 | Henry Lynch | 9 | Son | None | Iowa |
| 27 | Catherine A Lynch | 7 | Daughter | None | Iowa |
| 28 | James W Holland | 65 | — | Teamster | Wisconsin |
| 29 | Lavina Holland | 61 | Wife | None | New York |
| 30 | Mary Holland THIS PERSON | 36 | Daughter | Supervisor | Iowa |
| 31 | Edward Holland | 28 | Son | Salesman | Iowa |
| 32 | Lavina Holland | 25 | Daughter | Typist | Iowa |
| 33 | Martin J Holland | 22 | Son | Laborer | Iowa |
| 34 | Charles Shiel | 38 | Lodger | Laborer | Pennsylvania |
| 35 | Eugene Lynch | 36 | Head | Salesman | Iowa |
| 36 | Esther Lynch | 30 | Wife | None | Iowa |
| 37 | Lucille Lynch | 16 | Daughter | None | Iowa |
| 38 | Eugene Lynch | 6 | Son | None | Iowa |
| 39 | Jack Lynch | 4 | Son | None | Iowa |
| 40 | Raymond Orange | 26 | Head | Superintendent | Iowa |
| 41 | Edith Orange | 22 | Wife | None | Iowa |
| 42 | Shirley F Orange | 1 | Daughter | None | Iowa |
| 43 | Henry Anderson | 49 | — | R R Clerk | Michigan |
| 44 | Sadie Anderson | 43 | Wife | None | Iowa |
| 45 | Virginia Anderson | 14 | Daughter | None | Iowa |
| 46 | William Grueble | 54 | Roomer | Printer | Iowa |
| 47 | Elmer Otto | 24 | — | Laborer | Iowa |
| 48 | Cordelia Otto | 21 | Wife | None | Iowa |
| 49 | Velma Otto | 2 | Daughter | None | Iowa |
| 50 | Barbara L Otto | 0 | Daughter | None | 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)