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John Mccormick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this John Mccormick across the 1920, 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a head (b.~1882), then head of a 7-person household.
Age 48
b. ~1882
Male
Head
Born: Illinois
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 20,000 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1882 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mccormick | Head | — | 48 | ~1882 |
| Howard Healy | Other | — | 22 | ~1908 |
| Raymond Mccormick | Son | — | 17 | ~1913 |
| Edward Mccormick | Son | — | 24 | ~1906 |
| Lawrence Mccormick | Son | — | 20 | ~1910 |
| Willah Healy | Spouse | — | 22 | ~1908 |
| Elizabeth Mccormick | Spouse | — | 46 | ~1884 |
Census Appearances
1920
Cook, Illinois
Head, age 38
Cook, Illinois · implied b. ~1882 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ireland |
| Occupation | Salesman |
| Industry | Pie |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Head, age 48
Cook, Illinois · implied b. ~1882 — 7 household members
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 23 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 20,000 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Other, age 58
Cook-County, Illinois · implied b. ~1882 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Brother-in-law |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park Village |
| 1935 Residence (County) | Cook |
| Occupation | Salesman |
| Industry | Paper |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 1000 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| 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 John Mccormick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mccormick
Head · 1930 · age 48 · b. ~1882 · 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:illinoiscensus00reel429:0527)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Mccormick THIS PERSON | 48 | Head | — | Illinois |
| 52 | Elizabeth Mccormick | 46 | Wife | Maid | Indiana |
| 53 | Edward Mccormick | 24 | Son | Chauffeur | Illinois |
| 54 | Lawrence Mccormick | 20 | Son | Helper | Illinois |
| 55 | Raymond Mccormick | 17 | Son | — | Illinois |
| 56 | Howard Healy | 22 | R | Chauffeur | Illinois |
| 57 | Willah Healy | 22 | Wife | — | Illinois |
| 58 | Heliodoro Figueroa | 44 | Head | Accountant | Mexico |
| 59 | Lella Figueroa | 40 | Wife | — | Alabama |
| 60 | Mercedes Figueroa | 19 | Daughter | — | Alabama |
| 61 | George E Mcroy | 46 | Head | Gas Attendant | Illinois |
| 62 | Edna Mcroy | 45 | Wife | Hostess | Kentucky |
| 63 | Ludwig Ostlund | 58 | Head | — | Sweden |
| 64 | John Ostlund | 22 | Son | Shipping Clerk | Illinois |
| 65 | Margaret C Ostlund | 17 | Daughter | — | Illinois |
| 66 | Olga Nestor | 37 | Boarder | Clerk Office | Russia |
| 67 | John Maiterferrin | 54 | Head | Clerk | Illinois |
| 68 | Lillian Maiterferrin | 50 | Wife | — | Illinois |
| 69 | John Jr Maiterferrin | 21 | Son | — | Illinois |
| 70 | James Maiterferrin | 20 | Son | — | Illinois |
| 71 | Harold Erlandson | 25 | Head | Salesman | Illinois |
| 72 | Hazel Erlandson | 25 | Wife | — | US |
| 73 | John T Dempsey | 34 | Head | Attorney | Wisconsin |
| 74 | John J Cassidy | 46 | Head | Sales Manager | Missouri |
| 75 | Margaret Cassidy | 44 | Wife | — | Illinois |
| 76 | Mary M Cassidy | 10 | Daughter | — | Missouri |
| 77 | John J Cassidy | 7 | Son | — | Illinois |
| 78 | Jerome Lynch | 27 | Brother-in-law | Expressman | Illinois |
| 79 | Mary E Collins | 56 | Aunt | Dressmaker | Irish Free State |
| 80 | Walter Hagedorn | 39 | Head | Steel Heater | Pennsylvania |
| 81 | Amy E Hagedorn | 43 | Wife | — | Illinois |
| 82 | Sarah Firth | 64 | Mother-in-law | — | England |
| 83 | Fred Palsgrove | 24 | Head | Truck Driver | Pennsylvania |
| 84 | Dorothy Palsgrove | 23 | Wife | — | Illinois |
| 85 | Elizabeth Davies | 48 | Head | Teacher | Illinois |
| 86 | Pearl H Davies | 47 | Sister | Accountant | Illinois |
| 87 | Andrew Christensen | 34 | Head | Ice Man | Denmark |
| 88 | Marie Christensen | 37 | Wife | — | Denmark |
| 89 | Gloria Christensen | 6 | Daughter | — | Illinois |
| 90 | Anthony Pingree | 34 | Head | Mechanic | Italy |
| 91 | Louise Pingree | 31 | Wife | — | Wisconsin |
| 92 | Mary L Pingree | 8 | Daughter | — | Illinois |
| 93 | Audrey R Pingree | 5 | Daughter | — | Illinois |
| 94 | John Resch | 73 | Father | — | Italy |
| 95 | Victor Matson | 39 | Head | Carpenter | Finland |
| 96 | Amelia Matson | 48 | Wife | — | Czechoslovakia |
| 97 | Helen Nielsen | 22 | Head | Stenographer | Illinois |
| 98 | Mary Nielsen | 20 | Sister | Stenographer | Illinois |
| 99 | Carl J Nielsen | 19 | Brother | Order Clerk | Illinois |
| 100 | Arthur Patterson | 26 | Head | Salesman | 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)