MH
Mary Harrington — 1930 US Census Record
Model Tree available1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Harrington across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed), with identified parents John & Mary — first a daughter (b.~1914), then head of a 5-person household.
Age 16
b. ~1914
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Harrington |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Ohio |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1914 |
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 |
|---|---|---|---|---|
| Mary Harrington | Daughter | — | 16 | ~1914 |
| John Harrington | Head | — | 46 | ~1884 |
| John Maas | Other | — | 50 | ~1880 |
| Frank Williams | Other | — | 30 | ~1900 |
| Mary Harrington | Spouse | — | 42 | ~1888 |
Census Appearances
1920
Cook, Illinois
Daughter, age 6
Cook, Illinois · implied b. ~1914 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Ohio |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 16
Cook, Illinois · implied b. ~1914 — 5 household members
| Surname | Harrington |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 27
Cook-County, Illinois · implied b. ~1913 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | Marie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | City of Chicago |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Harrington across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Harrington (~0.92 confidence) and mother Mary Harrington (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Harrington
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Mary Harrington
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Harrington
Daughter · 1930 · age 16 · b. ~1914 · Illinois
★ You are viewing this record
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:illinoiscensus00reel479:0493)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Moran | 46 | Head | Buyer | Irish Free State |
| 2 | Catherine M. Moran | 31 | Wife | — | Illinois |
| 3 | Frank R. Moran | 15 | Son | — | Illinois |
| 4 | John J. Moran | 12 | Son | — | Illinois |
| 5 | Robert V. Moran | 10 | Son | — | Illinois |
| 6 | Mary E. Moran | 8 | Daughter | — | Illinois |
| 7 | John E. Harrington | 46 | Head | Attorney | Indiana |
| 8 | Mary S. Harrington | 42 | Wife | — | Ohio |
| 9 | Mary E. Harrington THIS PERSON | 16 | Daughter | — | Illinois |
| 10 | John W. Maas | 50 | Brother-in-law | Sign Painter | Ohio |
| 11 | Frank Williams | 30 | Cousin | Mail Carrier | Indiana |
| 12 | Aloysius Kominski | 47 | Head | Jeweler | Illinois |
| 13 | Sarah S. Kominski | 40 | Wife | — | Wisconsin |
| 14 | Roger F. Kominski | 16 | Son | — | Wisconsin |
| 15 | James A. Kominski | 14 | Son | — | Illinois |
| 16 | Marguerite V. Kominski | 13 | Daughter | — | Illinois |
| 17 | Philip H. Kominski | 9 | Son | — | Illinois |
| 18 | Jerome B. Kominski | 8 | Son | — | Illinois |
| 19 | George W. Hall | 59 | Head | Printer | Ohio |
| 20 | Louisa A. Hall | 48 | Wife | — | Minnesota |
| 21 | Archibald S. Hall | 21 | Son | — | Minnesota |
| 22 | Elmer L. R. Hall | 18 | Son | — | Michigan |
| 23 | Louise J. Hall | 15 | Daughter | — | Illinois |
| 24 | Elizabeth R. Hielke | 62 | Head | — | Illinois |
| 25 | John J. O'Brien | 45 | Head | Police Lieutenant | Illinois |
| 26 | Adah S. O'Brien | 43 | Wife | Teacher | Illinois |
| 27 | John J. Jr. O'Brien | 18 | Son | Clerk | Illinois |
| 28 | George G. O'Brien | 16 | Son | Clerk | Illinois |
| 29 | Charles S. O'Brien | 15 | Son | — | Illinois |
| 30 | James J. O'Brien | 13 | Son | — | Illinois |
| 31 | Adah J. O'Brien | 12 | Daughter | — | Illinois |
| 32 | Eugene E. O'Brien | 10 | Son | — | Illinois |
| 33 | Arthur A. O'Brien | 3 | Son | — | Illinois |
| 34 | Fred E. Olson | 43 | Head | Salesman | Norway |
| 35 | Anna Olson | 42 | Wife | — | Illinois |
| 36 | Anna L. Olson | 13 | Daughter | — | Illinois |
| 37 | Alice J. Olson | 10 | Daughter | — | Illinois |
| 38 | Mildred J. Olson | 7 | Daughter | — | Illinois |
| 39 | Norman E. Olson | 5 | Son | — | Illinois |
| 40 | Fred S. Olson | 2 | Son | — | Illinois |
| 41 | Peter S. Olson | 78 | Head | — | Norway |
| 42 | Laura S. Olson | 76 | Wife | — | Norway |
| 43 | Louis J. Schroeder | 57 | Head | Asst. Salesman | Illinois |
| 44 | Emma M. Schroeder | 51 | Wife | — | Illinois |
| 45 | Alice M. Schroeder | 29 | Daughter | Clerk | Illinois |
| 46 | Jean D. Marquette | 7 | Granddaughter | — | Illinois |
| 47 | Albert H. Glander | 59 | Head | Foreman | Illinois |
| 48 | Elizabeth M. Glander | 51 | Wife | — | England |
| 49 | Thomas L. Glander | 26 | Son | Clerk | Illinois |
| 50 | Albert B. Glander | 23 | Son | Clerk | Illinois |
Pedigree Summary
Mary
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)