MP
Mary Peck — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Winneshiek-County, Iowa
Our Model Tree links this Mary Peck across the 1930 and 1940 US Censuses in Winneshiek-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Winneshiek-County, Iowa |
| Surname | Peck |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Decorah |
| 1935 Residence (County) | Winneshiek |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Decorah |
| Est. Birth Year | ~1928 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Peck | Daughter | — | 12 | ~1928 |
| Edwin Peck | Son | — | 11 | ~1929 |
| Nancy Peck | Daughter | — | 6 | ~1934 |
| Chester Peck | Head | — | 39 | ~1901 |
| Margaret Peck | Spouse | — | 39 | ~1901 |
| John Peck | Son | — | 2 | ~1938 |
| James Peck | Son | — | 14 | ~1926 |
Census Appearances
1930
Winneshiek, Iowa
Daughter, age 2
Winneshiek, Iowa · implied b. ~1928 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peck |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Winneshiek-County, Iowa
Daughter, age 12
Winneshiek-County, Iowa · implied b. ~1928 — 7 household members
| Surname | Peck |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Decorah |
| 1935 Residence (County) | Winneshiek |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| 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 Peck across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Peck
Daughter · 1940 · age 12 · b. ~1928 · Iowa
★ You are viewing this record
Sibling
James Peck
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edwin Peck
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Peck
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Peck
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Winneshiek-County, Iowa
Open full size
1940 US Federal Census — Winneshiek-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01213-00698)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Moe | 25 | — | Salesman | Iowa |
| 2 | Betty Moe | 22 | Wife | — | Iowa |
| 3 | Frederick C. Helwig | 36 | Head | Radio Serviceman | Iowa |
| 4 | Velma M. Helwig | 32 | Wife | — | S. Dakota |
| 5 | John A. Mcintosh | 57 | Head | Carpenter | Iowa |
| 6 | Sarah Mcintosh | 61 | Wife | — | Wisconsin |
| 7 | Archibald V. Mcintosh | 21 | Son | Plumber | Iowa |
| 8 | Raymond B. Smalley | 43 | Head | Handy Man | Iowa |
| 9 | Elsie M. Smalley | 40 | Wife | — | Iowa |
| 10 | Sydell D. Smalley | 17 | Daughter | — | Iowa |
| 11 | John Riehl | 24 | Lodger | Laborer | Minnesota |
| 12 | Chester K. Peck | 39 | Head | Dentist | Iowa |
| 13 | Margaret O. Peck | 39 | Wife | — | Iowa |
| 14 | James R. Peck | 14 | Son | — | Iowa |
| 15 | Mary E. Peck THIS PERSON | 12 | Daughter | — | Iowa |
| 16 | Edwin C. Peck | 11 | Son | — | Iowa |
| 17 | Nancy A. Peck | 6 | Daughter | — | Iowa |
| 18 | John R. Peck | 2 | Son | — | Iowa |
| 19 | Daniel C. Jordan | 76 | Head | — | Norway |
| 20 | Annie E. Jordan | 76 | Wife | — | Iowa |
| 21 | Artie D. Jordan | 44 | Daughter | — | Minnesota |
| 22 | Solveig D. Jordan | 35 | Daughter | — | Minnesota |
| 23 | Fred J. Mcneil | 67 | Head | Dry Goods Store | New York |
| 24 | Agnes M. Mcneil | 66 | Wife | — | Iowa |
| 25 | Grace E. Mcneil | 39 | Daughter | Clerk | Iowa |
| 26 | Velma E. Johnson | 18 | Maid | Maid | Minnesota |
| 27 | Ashley E. Ellingson | 42 | Head | Policeman | Iowa |
| 28 | Ruth Ellingson | 43 | Wife | — | Iowa |
| 29 | James Ellingson | 16 | Son | — | Iowa |
| 30 | Virginia Ellingson | 13 | Daughter | — | Iowa |
| 31 | Norma Ellingson | 10 | Daughter | — | Iowa |
| 32 | Howard Ellingson | 8 | Son | — | Iowa |
| 33 | Martin L. Larsin | 53 | Head | Handyman | Nebraska |
| 34 | Anna W. Larsin | 58 | Wife | — | Wisconsin |
| 35 | Verna M. Mcmullen | 65 | Head | — | Iowa |
| 36 | Madeline A. Mcmullen | 26 | Daughter | Housework | Iowa |
| 37 | Bernard O. Mcmullen | 23 | Son | Laborer | Iowa |
| 38 | Charles E. Allen | 65 | Head | Laborer | Iowa |
| 39 | Charlotte Allen | 58 | Wife | — | Florida |
| 40 | Lloyd C. Allen | 25 | Son | — | Iowa |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)