MC
Mary Cunningham — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Mary Cunningham across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 2-person household.
Age 69
b. ~1871
Female
Head
Born: Iowa
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Cunningham |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1871 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alice Cunningham | Daughter | — | 30 | ~1910 |
| Mary Cunningham | Head | — | 69 | ~1871 |
Census Appearances
1920
Polk, Iowa
Spouse, age 49
Polk, Iowa · implied b. ~1871 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cunningham |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Spouse, age 58
Polk, Iowa · implied b. ~1872 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cunningham |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 36 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Head, age 69
Polk-County, Iowa · implied b. ~1871 — 2 household members
| Surname | Cunningham |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 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 Cunningham 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 Cunningham
Head · 1940 · age 69 · b. ~1871 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01194-00383)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Jack Kuhl | 19 | Grandson | Grocery Clerk | Iowa |
| 42 | Harriett Mcgee | 16 | Daughter | — | Iowa |
| 44 | Mary Cunningham THIS PERSON | 69 | Head | — | Iowa |
| 45 | Alice Cunningham | 30 | Daughter | Timekeeper | Iowa |
| 46 | Thomas J. Watson | 41 | Head | Clerk | England |
| 47 | Tracy M. Watson | 43 | Wife | — | Iowa |
| 48 | Jack T. Watson | 19 | Son | — | Iowa |
| 49 | Gould Baker | 43 | Head | Branch Manager | Iowa |
| 50 | Anna G. Baker | 38 | Wife | — | Missouri |
| 51 | Betty Baker | 19 | Daughter | Clerk | Iowa |
| 52 | Lorraine Baker | 17 | Daughter | — | Iowa |
| 53 | Colleen Baker | 10 | Daughter | — | Iowa |
| 54 | Esther L. Elliott | 44 | Head | Saleslady | Iowa |
| 55 | Norman Dale Elliott | 18 | Son | New Worker | Iowa |
| 56 | Paul E. Elliott | 20 | Son | Baker | Iowa |
| 57 | Bernice Elliott | 18 | Daughter | — | Iowa |
| 58 | Gail Lee Elliott | 3 | Grand daughter | — | Iowa |
| 59 | Dale E. Elliott | 0 | Grand son | — | Iowa |
| 60 | Lillie Bell | 65 | Mother | Housekeeper | Iowa |
| 61 | Robert Bell | 28 | Brother | Laborer | Iowa |
| 62 | Sam G. Hiatt | 62 | Head | Barber | Iowa |
| 63 | Mary Hiatt | 63 | Wife | — | Iowa |
| 64 | Jack Hiatt | 19 | Son | Meat Cutter | Iowa |
| 65 | Marion C. Mcdonald | 36 | Head | Proprietor | Iowa |
| 66 | Marie Mcdonald | 37 | Wife | Bookkeeper | Iowa |
| 67 | Roderick Thornton Mcdonald | 19 | Step son | Service Man | Iowa |
| 68 | Lyle Shelhamer | 34 | Head | Credit Manager | Nebraska |
| 69 | Martha Shelhamer | 31 | Wife | — | Nebraska |
| 70 | Lyla Shelhamer | 3 | Daughter | — | Nebraska |
| 71 | Fred H. Curl | 67 | Head | Mechanic | Iowa |
| 72 | Edwin V. Davidson | 26 | Head | Clerk | Iowa |
| 73 | Wanda O. Davidson | 24 | Wife | — | Iowa |
| 74 | Donna Davidson | 6 | Daughter | — | Iowa |
| 75 | Viola O. Yarham | 40 | Head | Baker | Iowa |
| 76 | Clarence Yarham | 20 | Son | Baker | Iowa |
| 77 | Stephen J. Iano | 23 | Head | Coal Miner | Kansas |
| 78 | Frances S. Iano | 22 | Wife | — | Iowa |
| 79 | Louise Iano | 3 | Daughter | — | 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)