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Mary Mccormick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Jefferson, Iowa
Our Model Tree links this Mary Mccormick across the 1920, 1930 and 1940 US Censuses in Jefferson, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1893), then head of a 6-person household.
Age 37
b. ~1893
Female
Spouse
Born: Iowa
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Jefferson, Iowa |
| Surname | McCormick |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Buchanan Township |
| Est. Birth Year | ~1893 |
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.
6 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Betty Mccormick | Daughter | — | 5 | ~1925 |
| Letha Mccormick | Daughter | — | 11 | ~1919 |
| Anna Mccormick | Daughter | — | 3 | ~1927 |
| Guy Mccormick | Head | — | 42 | ~1888 |
| George Mccormick | Son | — | 8 | ~1922 |
| Mary Mccormick | Spouse | — | 37 | ~1893 |
Census Appearances
1920
Jefferson, Iowa
Spouse, age 27
Jefferson, Iowa · implied b. ~1893 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Jefferson, Iowa
Spouse, age 37
Jefferson, Iowa · implied b. ~1893 — 6 household members
| Surname | McCormick |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Jefferson-County, Iowa
Spouse, age 47
Jefferson-County, Iowa · implied b. ~1893 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mc Cormick |
| Given Name | Mary A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Center twp |
| 1935 Residence (County) | Jefferson |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Mccormick 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 Mccormick
Spouse · 1930 · age 37 · b. ~1893 · Iowa
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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 — Jefferson, Iowa
Open full size
1930 US Federal Census — Jefferson, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel661:0132)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Logan H. Ogden | 37 | Head | Farmer | Illinois |
| 2 | Edythe G. Ogden | 33 | Wife | — | Iowa |
| 3 | Willard L. Ogden | 9 | Son | — | Iowa |
| 4 | Lyndon L. Ogden | 4 | Son | — | Iowa |
| 5 | Robert L. Ogden | 2 | Son | — | Iowa |
| 6 | Lelah E. Ogden | 1 | Daughter | — | Iowa |
| 7 | Guy Mccormick | 42 | Head | Farmer | Iowa |
| 8 | Mary A. Mccormick THIS PERSON | 37 | Wife | — | Iowa |
| 9 | Letha R. Mccormick | 11 | Daughter | — | Iowa |
| 10 | George L. Mccormick | 8 | Son | — | Iowa |
| 11 | Betty L. Mccormick | 5 | Daughter | — | Iowa |
| 12 | Anna M. Mccormick | 3 | Daughter | — | Iowa |
| 13 | Elmer C. Johnson | 46 | Head | Farmer | Sweden |
| 14 | Edith B. Johnson | 36 | Wife | — | Iowa |
| 15 | Donald E. Johnson | 12 | Son | — | Iowa |
| 16 | Lawrence M. Johnson | 8 | Son | — | Iowa |
| 17 | Arline M. Johnson | 4 | Daughter | — | Iowa |
| 18 | Pete Coon | 36 | Hired man | Laborer | Iowa |
| 19 | Albert E. Oleson | 65 | Head | Farmer | Sweden |
| 20 | Anna L. Oleson | 69 | Wife | — | Sweden |
| 21 | Frank L. Ogden | 69 | Head | Farmer | Illinois |
| 22 | Sarah J. Ogden | 69 | Wife | — | Indiana |
| 23 | Edward D. Mccormick | 31 | Head | Farmer | Iowa |
| 24 | Gladys M. Mccormick | 29 | Wife | — | Iowa |
| 25 | Lenore R. Mccormick | 7 | Daughter | — | Iowa |
| 26 | Alice J. Mccormick | 6 | Daughter | — | Iowa |
| 27 | Doris D. Mccormick | 3 | Daughter | — | Iowa |
| 28 | Bert C. Roberts | 44 | Head | Operator | Iowa |
| 29 | Ethel B. Roberts | 44 | Wife | — | Iowa |
| 30 | Darrell J. Whitaker | 27 | Head | Farmer | Iowa |
| 31 | Cecile L. Whitaker | 23 | Wife | — | Iowa |
| 32 | Will Roach | 68 | Head | Farmer | Iowa |
| 33 | Katherine S. Roach | 55 | Wife | — | Ohio |
| 34 | Irene Roach | 33 | Daughter | — | Iowa |
| 35 | Elois G. Roach | 31 | Son | Farmer | Iowa |
| 36 | Cecil J. Roach | 26 | Son-in-law | Laborer | Iowa |
| 37 | Joe Roach | 22 | Son | Laborer | Iowa |
| 38 | Charles A. Root | 62 | Head | Farmer | Ohio |
| 39 | Nellie S. Root | 60 | Wife | — | Iowa |
| 40 | Charles H. Clark | 54 | Head | Farmer | Iowa |
| 41 | Anna M. Clark | 53 | Wife | — | Iowa |
| 42 | Florence E. Clark | 8 | Daughter | — | Iowa |
| 43 | Hugh Brush | 69 | Head | Farmer | Iowa |
| 44 | John S. Jenks | 58 | Head | Farmer | Iowa |
| 45 | Pearl L. Jenks | 55 | Wife | — | Iowa |
| 46 | Paul L. Jenks | 25 | Son | Laborer | Iowa |
| 47 | Benjamin F. Murphy | 46 | Head | Farmer | Iowa |
| 48 | Nellie E. Murphy | 40 | Wife | — | Nebraska |
| 49 | Frank G. Swan | 44 | Head | Farmer | Iowa |
| 50 | Mabel L. Swan | 40 | Wife | — | Iowa |
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)