MK
Mary Koch — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Sangamon, Illinois
Our Model Tree links this Mary Koch across the 1910, 1920 and 1930 US Censuses in Sangamon, Illinois (XGBoost, ~Confirmed) — first a head (b.~1856), then head of a 2-person household.
Age 64
b. ~1856
Female
Head
Born: Germany
Widowed
1920 Census Record Details
| Census Year | 1920 |
| Location | Sangamon, Illinois |
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Widowed |
| Birthplace | Germany |
| Year of Immigration | 1873 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Germany |
| Year of Naturalization | 1880 |
| Birthplace (normalized) | germany |
| Township / Ward | Springfield City |
| Est. Birth Year | ~1856 |
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.
2 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Elsie Koch | Daughter | — | 26 | ~1894 |
| Mary Koch | Head | — | 64 | ~1856 |
Census Appearances
1910
Sangamon, Illinois
Head, age 55
Sangamon, Illinois · implied b. ~1855 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Germany |
| Children Born | 18 |
| Children Living | 6 |
| Year of Immigration | 1872 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | nothing |
| Industry | House |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1920
Sangamon, Illinois
Head, age 64
Sangamon, Illinois · implied b. ~1856 — 2 household members
| Surname | Koch |
| Given Name | Mary |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Widowed |
| Birthplace | Germany |
| Year of Immigration | 1873 |
| 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 |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Germany |
| Year of Naturalization | 1880 |
| Birthplace (normalized) | germany |
1930
Sangamon, Illinois
Head, age 74
Sangamon, Illinois · implied b. ~1856 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | Marie |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1872 |
| Age at First Marriage | 28 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Home Owned/Rented | O |
| Home Value / Rent | 6500 |
| Radio Set | R |
| 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 3 US Census years (1910, 1920 and 1930) in Sangamon, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Koch
Head · 1920 · age 64 · b. ~1856 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Sangamon, Illinois
Open full size
1920 US Federal Census — Sangamon, Illinois
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu406unit:1093)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bertha Bradley | 29 | wife | None | Illinois |
| 2 | Ellington Jr Bradley | 4 | son | None | Illinois |
| 3 | Sophia Nye | 19 | boarder | None | Illinois |
| 4 | Mary Koch THIS PERSON | 64 | head | None | Germany |
| 5 | Elsie Koch | 26 | daughter | Stenographer | Illinois |
| 6 | William H. Lytarger | 49 | head | Miner | Illinois |
| 7 | Amelia Lytarger | 46 | wife | None | Illinois |
| 8 | Julius M. Lytarger | 20 | son | None | Illinois |
| 9 | Conrad W. Lytarger | 16 | son | None | Illinois |
| 10 | Charles S. Griffith | 56 | head | Miner | Illinois |
| 11 | Lillie M. Griffith | 43 | wife | None | Illinois |
| 12 | Elmer Griffith | 20 | son | Clerk | Illinois |
| 13 | Ruby M. Griffith | 17 | daughter | Meter Tester | Illinois |
| 14 | Fannie J. Griffith | 15 | daughter | None | Illinois |
| 15 | Thomas Hardy | 62 | head | Miner | England |
| 16 | Margaret A. Hardy | 51 | wife | None | England |
| 17 | Frank L. Renetzky | 33 | head | Agent | Illinois |
| 18 | Lora E. Renetzky | 29 | wife | None | Missouri |
| 19 | Edna L. Renetzky | 10 | daughter | None | Illinois |
| 20 | Grace W. Renetzky | 7 | daughter | None | Illinois |
| 21 | Lee A. Renetzky | 4 | son | None | Illinois |
| 22 | Robert Pershing Renetzky | 1 | son | None | Illinois |
| 23 | George A. Bryan | 56 | father-in-law | Blacksmith | Missouri |
| 24 | Elizabeth Bryan | 49 | mother-in-law | None | Missouri |
| 25 | Dorothy Bryan | 14 | sister-in-law | None | Illinois |
| 26 | Bernadine Bryan | 9 | sister-in-law | None | Illinois |
| 27 | Rudolph Young | 31 | head | Labour | Kansas |
| 28 | Goldie Young | 29 | wife | None | Illinois |
| 29 | Helena Schindel | 55 | head | None | Wisconsin |
| 30 | Margaret Schindel | 25 | daughter | Saleslady | Illinois |
| 31 | Frank G. Schindel | 24 | son | Farm Labor | Illinois |
| 32 | Theresa Meyer | 22 | daughter | None | Wisconsin |
| 33 | John W. Bayless | 60 | head | Fireman | Kentucky |
| 34 | Bernice L. Bayless | 52 | wife | None | Kentucky |
| 35 | Eleanor Wilkin | 76 | head | None | England |
| 36 | Leonard T. Babcock | 37 | son-in-law | Buyer | Illinois |
| 37 | Ada E. Babcock | 37 | daughter | None | England |
| 38 | L. Troy Babcock | 16 | grandson | None | Illinois |
| 39 | Henry D. Salinger | 41 | head | Dealer | Illinois |
| 40 | Elizabeth D. Salinger | 39 | wife | None | Illinois |
| 41 | Mildred M. Salinger | 15 | daughter | None | Illinois |
| 42 | Fred W. Salinger | 14 | son | None | Illinois |
| 43 | Henry Jr. Salinger | 8 | son | None | Illinois |
| 44 | Elizabeth Burns | 81 | mother-in-law | None | Scotland |
| 45 | Frederick Bayless | 39 | head | Carpenter | Kentucky |
| 46 | Minnie J. Bayless | 32 | wife | None | Illinois |
| 47 | Dalia Bayless | 9 | son | None | Illinois |
| 48 | Harold A. Bayless | 2 | son | None | Illinois |
| 49 | Evelyn R. Bayless | 1 | daughter | None | Illinois |
| 50 | John W. Bayless | 0 | son | None | Illinois |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)