MK
Mary Koch — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Koch across the 1900, 1910, 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1855), then head of a 3-person household.
Age 75
b. ~1855
Female
Spouse
Born: Germany
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1884 |
| Age at First Marriage | 22 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Township / Ward | Elgin City |
| Est. Birth Year | ~1855 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Carl Koch | Head | — | 75 | ~1855 |
| Mary Koch | Spouse | — | 75 | ~1855 |
| Frank Koch | Son | — | 35 | ~1895 |
Census Appearances
1900
Cook, Illinois
Spouse, age 43
Cook, Illinois · implied b. ~1857 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Germany |
| Birth Month | July |
| Birth Year | 1857 |
| Year of Immigration | 1887 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1910
Cook, Illinois
Spouse, age 54
Cook, Illinois · implied b. ~1856 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Germany |
| Years Married | 35 |
| Children Born | 10 |
| Children Living | 5 |
| Year of Immigration | 1886 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1920
Cook, Illinois
Spouse, age 64
Cook, Illinois · implied b. ~1856 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1884 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Year of Naturalization | 1900 |
| Birthplace (normalized) | germany |
1930
Cook, Illinois
Spouse, age 75
Cook, Illinois · implied b. ~1855 — 3 household members
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1884 |
| Age at First Marriage | 22 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
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 Koch across 4 US Census years (1900, 1910, 1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
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This person
Anchor record
Mary Koch
Spouse · 1930 · age 75 · b. ~1855 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel500:0934)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Anna Edlund | 60 | Wife | — | Sweden |
| 52 | Elsa S Edlund | 38 | Daughter | — | Illinois |
| 53 | Emmett Schroeder | 33 | Head | Sign Painter | Illinois |
| 54 | Irene Schroeder | 32 | Wife | — | Illinois |
| 55 | Shirley Schroeder | 4 | Daughter | — | Illinois |
| 56 | Robert E Schroeder | 1 | Son | — | Illinois |
| 57 | Fred Clausen | 37 | Head | Gravel Pit | Germany |
| 58 | Viva Clausen | 36 | Wife | — | Nebraska |
| 59 | Charles Wilkinson | 22 | Head | Gardner | Illinois |
| 60 | Florence Wilkinson | 21 | Wife | — | Illinois |
| 61 | Frank Schuaf | 28 | Head | Repair Man | Illinois |
| 62 | Clarence Schuaf | 25 | Brother | Electrician | Illinois |
| 63 | Helen Schuaf | 22 | Sister | Watchworker | Illinois |
| 64 | Dorothy Schuaf | 15 | Sister | — | Illinois |
| 65 | Benn Yonker | 21 | Head | Waiter | Minnesota |
| 66 | Genevive Yonker | 19 | Wife | — | Minnesota |
| 67 | Bernard Yonker | 0 | Son | — | Minnesota |
| 68 | George W Eygu | 61 | Head | Printer | Illinois |
| 69 | Anna Eygu | 48 | Wife | — | Illinois |
| 70 | Edgar E Eygu | 38 | Son | Salesman | Illinois |
| 71 | Fred M Hansen | 55 | Head | Salesman | Denmark |
| 72 | Harriet B Hansen | 53 | Wife | — | Illinois |
| 73 | Beatrice Marguerite Hansen | 21 | Daughter | — | Illinois |
| 74 | Phineas H Smith | 42 | Head | Watch Worker | Illinois |
| 75 | Alice P Smith | 40 | Wife | — | Illinois |
| 76 | Stamont Smith | 18 | Son | Salesman | Illinois |
| 77 | Irma C Smith | 16 | Daughter | — | Illinois |
| 78 | Marion R Smith | 14 | Daughter | — | Illinois |
| 79 | Kathren B Smith | 11 | Daughter | — | Illinois |
| 80 | Donal B Smith | 8 | Son | — | Illinois |
| 81 | Richard E Smith | 7 | Son | — | Illinois |
| 82 | Roy Sturges | 55 | Head | Stationary Engineer | Illinois |
| 83 | Julia Sturges | 50 | Wife | — | Illinois |
| 84 | August Quinn | 64 | Head | Bricklayer | Sweden |
| 85 | Augusta Quinn | 57 | Wife | — | Sweden |
| 86 | Ellen Murray | 37 | Daughter | — | Sweden |
| 87 | Theodore Quinn | 35 | Son | Printer | Illinois |
| 88 | Earl J Murray | 7 | Son | — | Illinois |
| 89 | Mary C Murray | 5 | Daughter | — | Illinois |
| 90 | Carl Koch | 75 | Head | Laborer | Germany |
| 91 | Mary Koch THIS PERSON | 75 | Wife | — | Germany |
| 92 | Frank Koch | 35 | Son | Shipping Clerk | Illinois |
| 93 | Fred Craniff | 37 | Head | Clerk | Illinois |
| 94 | Clara Craniff | 30 | Wife | Watchworker | United States |
| 95 | Albert Huske | 26 | Head | Engineer | Illinois |
| 96 | Ruth Huske | 23 | Wife | — | Illinois |
| 97 | Fred Nash | 73 | Uncle | — | Germany |
| 98 | John P Taylor | 28 | Head | Spring Maker | Illinois |
| 99 | Margaret Taylor | 23 | Wife | — | Illinois |
| 100 | John H Taylor | 0 | Son | — | Illinois |
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)