MK
Mary Klein — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Klein across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1894), then head of a 5-person household.
Age 36
b. ~1894
Female
Spouse
Born: Hungary
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Naturalized |
| Year of Immigration | 1914 |
| Age at First Marriage | 20 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Township / Ward | Chicago 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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph Mazaros | Other | — | 27 | ~1903 |
| Margaret Mazaros | Daughter | — | 28 | ~1902 |
| Helen Klein | Other | — | 24 | ~1906 |
| Mary Klein | Spouse | — | 36 | ~1894 |
| Joseph Klein | Head | — | 43 | ~1887 |
Census Appearances
1920
Cook, Illinois
Spouse, age 21
Cook, Illinois · implied b. ~1899 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Hungary |
| Year of Immigration | 1911 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Magyar |
| Birth Country | Hungary |
| Year of Naturalization | 1914 |
| Birthplace (normalized) | hungary |
1930
Cook, Illinois
Spouse, age 36
Cook, Illinois · implied b. ~1894 — 5 household members
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Naturalized |
| Year of Immigration | 1914 |
| Age at First Marriage | 20 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Cook-County, Illinois
Spouse, age 48
Cook-County, Illinois · implied b. ~1892 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Margaret A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Industry | H |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Klein across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Klein
Spouse · 1930 · age 36 · b. ~1894 · 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:illinoiscensus00reel489:0386)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | O. William Olson | 55 | Head | President | Maine |
| 2 | Emma Olson | 53 | Wife | — | Norway |
| 3 | Florence Olson | 30 | Daughter | — | Illinois |
| 4 | Myrtle Olson | 25 | Daughter | — | Illinois |
| 5 | Cyrus Weston | 73 | Head | Consulting Engineer | Michigan |
| 6 | Lydia Weston | 77 | Wife | — | Russia |
| 7 | Cornelius Lynch | 15 | Niece | — | Michigan |
| 8 | Mildred Lynch | 6 | Niece | — | Michigan |
| 9 | Anna Rachel | 21 | Maid | Maid | Austria |
| 10 | L. George Schmidt | 32 | Head | Cashier | Illinois |
| 11 | Mary Schmidt | 32 | Wife | — | Wisconsin |
| 12 | Suzanne Schmidt | 3 | Daughter | — | Illinois |
| 13 | Mollie Pierson | 23 | Maid | Maid | Wisconsin |
| 14 | J. Harry Boyles | 38 | Head | Owner | Illinois |
| 15 | Julia Boyles | 29 | Wife | — | Illinois |
| 16 | June Boyles | 3 | Daughter | — | Illinois |
| 17 | Arthur Duffy | 76 | Head | — | Ireland |
| 18 | Mary Duffy | 57 | Daughter | — | Illinois |
| 19 | N. Bert Caldwell | 55 | Head | Clerk | Illinois |
| 20 | Georgia Caldwell | 50 | Wife | — | Illinois |
| 21 | Harry Caldwell | 12 | Son | — | Indiana |
| 22 | Gilbert Martin | 58 | Head | Doctor | Illinois |
| 23 | C. May Martin | 51 | Wife | — | Illinois |
| 24 | Gilbert Jr. Martin | 28 | Son | Student | Illinois |
| 25 | W. John Martin | 34 | Head | Owner | Illinois |
| 26 | W. John Jr. Martin | 5 | Son | — | Illinois |
| 27 | Mary Martin | 2 | Daughter | — | Illinois |
| 28 | Marie Bursted | 55 | Maid | Maid | Norway |
| 29 | Helene Drewes | 23 | Maid | Maid | Illinois |
| 30 | Josephine Douglas | 68 | Head | — | Wisconsin |
| 31 | W. Frank Hopkins | 44 | Daughter | Partner | Illinois |
| 32 | Josephine Hopkins | 24 | Grand Daughter | — | Illinois |
| 33 | Frank Perchaneki | 47 | Head | Janitor | Austria |
| 34 | Johanna Perchaneki | 42 | Wife | — | Austria |
| 35 | Edith Perchaneki | 23 | Daughter | — | Austria |
| 36 | D. Sigrid Johnson | 65 | Head | — | Pennsylvania |
| 37 | Ruth Johnson | 25 | Daughter | Asst. Mgr. | Illinois |
| 38 | Robert Berghoff | 40 | Head | Doctor | Indiana |
| 39 | Mary Berghoff | 34 | Wife | — | Illinois |
| 40 | Lila Darlyn | 38 | Maid | Maid | Finland |
| 41 | Mary Koehler | 75 | Head | — | Ohio |
| 42 | Emma Koehler | 68 | Sister | Art | Ohio |
| 43 | Herman Koehler | 62 | Brother | Price Ticket | Ohio |
| 44 | Joseph Klein | 43 | Head | Musician | Hungary |
| 45 | Mary Klein THIS PERSON | 36 | Wife | — | Hungary |
| 46 | Margaret Mazaros | 28 | Daughter | Bookkeeper | Hungary |
| 47 | Helen Klein | 24 | Sister | Steno. | Ohio |
| 48 | Joseph Mazaros | 27 | Son-in-law | Cashier | Hungary |
| 49 | Michael Fitzgerald | 60 | Head | — | Germany |
| 50 | Henry Fitzgerald | 30 | Son | President | 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)