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Mary Lang — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Sioux-County, Iowa
Our Model Tree links this Mary Lang across the 1930 and 1940 US Censuses in Sioux-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 10-person household.
Age 10
b. ~1930
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sioux-County, Iowa |
| Surname | Lang |
| Given Name | Mary Ann |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Hawarden city |
| 1935 Residence (County) | Sioux |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Hawarden City |
| Est. Birth Year | ~1930 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Helen Lang | Daughter | — | 18 | ~1922 |
| James Lang | Son | — | 12 | ~1928 |
| William Lang | Son | — | 20 | ~1920 |
| Frances Lang | Son | — | 8 | ~1932 |
| John Lang | Son | — | 14 | ~1926 |
| Louise Lang | Daughter | — | 17 | ~1923 |
| Frank Lang | Head | — | 49 | ~1891 |
| Mary Lang | Daughter | — | 10 | ~1930 |
| Joe Lang | Son | — | 5 | ~1935 |
| Helen Lang | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Sioux, Iowa
Daughter, age 1
Sioux, Iowa · implied b. ~1929 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lang |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Sioux-County, Iowa
Daughter, age 10
Sioux-County, Iowa · implied b. ~1930 — 10 household members
| Surname | Lang |
| Given Name | Mary Ann |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Hawarden city |
| 1935 Residence (County) | Sioux |
| Highest Grade | No 3 |
| 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 Lang across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lang
Daughter · 1940 · age 10 · b. ~1930 · Iowa
★ You are viewing this record
Sibling
William Lang
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louise Lang
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joe Lang
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Lang
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Lang
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Lang
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Lang
Sibling · 1940 · age 12
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 — Sioux-County, Iowa
Open full size
1940 US Federal Census — Sioux-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01205-00025)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Doris Schluter | 16 | daughter | — | Iowa |
| 2 | Donald Schluter | 14 | son | — | Iowa |
| 3 | Lois Schluter | 11 | daughter | — | Iowa |
| 4 | Loyd Schluter | 10 | son | — | Iowa |
| 5 | Lorna Schluter | 8 | daughter | — | Iowa |
| 6 | Colin Grems | 36 | Head | Ass. Manager Of Lumber Co. | Minn. |
| 7 | Viola O. Grems | 35 | wife | — | So. Dak. |
| 8 | Linda Grems | 1 | daughter | — | Iowa |
| 9 | Edith B. Miller | 52 | Head | Teaching | So. Dak. |
| 10 | Lillian Maynard | 68 | roomer | — | Wisconsin |
| 11 | M. C. Callen | 71 | Head | Live Stock Buy Agents | Wisconsin |
| 12 | Katherine B. Callen | 64 | wife | — | So. Dak. |
| 13 | Gene Callen | 30 | son | Farming | Iowa |
| 14 | Harry Swift | 47 | Head | Carpenter General | Iowa |
| 15 | Ruth B. Swift | 44 | wife | — | Iowa |
| 16 | Bertra Vail | 54 | Mother in law | — | York State |
| 17 | Dave Meulenburg | 51 | Head | Manager Of Lumber Co. | So. Dak. |
| 18 | Elizabeth B. Meulenburg | 34 | wife | — | So. Dak. |
| 19 | Sandra Joan Meulenburg | 5 | daughter | — | Iowa |
| 20 | George Heldt | 48 | Head | John Deere Implement Shop | So. Dak. |
| 21 | Irma Heldt | 46 | wife | — | So. Dak. |
| 22 | Harold Heldt | 21 | son | Works In Implement Shop | So. Dak. |
| 23 | Lola Heldt | 18 | daughter | Worker In Office | So. Dak. |
| 24 | Doris Heldt | 8 | daughter | — | So. Dak. |
| 25 | John Hodgson | 58 | Head | Mason | So. Dak. |
| 26 | Inez Hodgson | 23 | daughter | House Maid | So. Dak. |
| 27 | Joseph Major | 82 | Roomer | — | England |
| 28 | Frank Lang | 49 | Head | City Laborer | New York |
| 29 | Helen O. Lang | 43 | wife | — | New York |
| 30 | William Lang | 20 | son | Clerk In Grocery Store | Iowa |
| 31 | Helen Lang | 18 | daughter | — | Iowa |
| 32 | Louise Lang | 17 | daughter | — | Iowa |
| 33 | John Lang | 14 | son | — | Iowa |
| 34 | James Lang | 12 | son | — | Iowa |
| 35 | Mary Ann Lang THIS PERSON | 10 | daughter | — | Iowa |
| 36 | Frances Lang | 8 | son | — | Iowa |
| 37 | Joe Lang | 5 | son | — | Iowa |
| 38 | John Mohlman | 51 | Head | W.P.A. Grading County Roads | Germany |
| 39 | Marie Mohlman | 46 | wife | — | Germany |
| 40 | Helen Mohlman | 23 | daughter | General Housework | Iowa |
Related Census Records
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)