MC
Mary Conrad — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Mary Conrad across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1903), then head of a 8-person household.
Age 37
b. ~1903
Female
Head
Born: Iowa
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Conrad |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Raymond Town |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Linen on Victoria |
| Industry | Service |
| Class of Worker | PW |
| Income (1939) | 750 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Linen On Victoria |
| Township / Ward | Raymond Town |
| Est. Birth Year | ~1903 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anita Conrad | Daughter | — | 10 | ~1930 |
| Louis Conrad | Son | — | 11 | ~1929 |
| Robert Conrad | Son | — | 13 | ~1927 |
| Wm Conrad | Son | — | 9 | ~1931 |
| Marie Conrad | Daughter | — | 12 | ~1928 |
| James Conrad | Son | — | 7 | ~1933 |
| Mary Conrad | Head | — | 37 | ~1903 |
| Hans Petersen | Other | — | 50 | ~1890 |
Census Appearances
1930
Black Hawk, …
Other, age 27
Black Hawk, Iowa · implied b. ~1903 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conrad |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 23 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Head, age 37
Black-Hawk-County, Iowa · implied b. ~1903 — 8 household members
| Surname | Conrad |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Widowed |
| Birthplace | Iowa |
| 1935 Residence (City) | Raymond Town |
| 1935 Residence (County) | Black Hawk |
| Occupation | Linen on Victoria |
| Industry | Service |
| Class of Worker | PW |
| Income (1939) | 750 |
| Highest Grade | H 2 |
| 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 Conrad across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Conrad
Head · 1940 · age 37 · b. ~1903 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01139-00677)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | A. R. Grant | 73 | Head | Minister | Alabama |
| 42 | Catherine Grant | 71 | Wife | — | Canada-English |
| 43 | Joyce Grant | 44 | Daughter | — | Wisconsin |
| 44 | George Brown | 71 | Head | Laborer | Iowa |
| 45 | Rosalie Brown | 64 | Wife | — | Illinois |
| 46 | John Brown | 22 | Son | Meat Cutter | Iowa |
| 47 | June Brown | 22 | Daughter | Fill Meat Sales | Iowa |
| 48 | Mathew Berend | 45 | Head | Post Office Clerk | Germany |
| 49 | Ursula Berend | 45 | Wife | — | Iowa |
| 50 | Irene Berend | 20 | Daughter | Gen'L Office | Iowa |
| 51 | Bernard Pint | 25 | Son-in-law | Laborer-Garage | Oklahoma |
| 52 | Leona Pint | 22 | Daughter | Beautician | Iowa |
| 53 | Paul Wagner | 44 | Head | Clerking | Iowa |
| 54 | Lillian Wagner | 42 | Wife | — | Iowa |
| 55 | Raymond Wagner | 15 | Son | — | Iowa |
| 56 | Maxine Wagner | 14 | Daughter | — | Iowa |
| 57 | Francis Frost | 20 | Employee | Clerk | Iowa |
| 58 | Mathias Becker | 68 | Head | Retired Farmer | Germany |
| 59 | Katharine Becker | 65 | Wife | — | Germany |
| 60 | Frank Traidl | 80 | Head | — | Germany |
| 61 | Mary Conrad THIS PERSON | 37 | Head | Linen On Victoria | Iowa |
| 62 | Robert Conrad | 13 | Son | — | Iowa |
| 63 | Marie Conrad | 12 | Daughter | — | Iowa |
| 64 | Louis Conrad | 11 | Son | — | Iowa |
| 65 | Anita Conrad | 10 | Daughter | — | Iowa |
| 66 | Wm Conrad | 9 | Son | — | Iowa |
| 67 | James Lee Conrad | 7 | Son | — | Iowa |
| 68 | Hans H. Petersen | 50 | Lodger | Mechanic | Iowa |
| 69 | Ernest Ackerman | 58 | Head | Laborer | England |
| 70 | Adelle Ackerman | 53 | Wife | — | New York |
| 71 | Viola Ackerman | 12 | Daughter | — | Iowa |
| 72 | John Callahan | 44 | Head | Salesman | Iowa |
| 73 | Gerald Callahan | 44 | Wife | — | Iowa |
| 74 | Elizabeth Callahan | 8 | Daughter | — | Iowa |
| 75 | F. J. Vallaher | 55 | Head | Priest | Iowa |
| 76 | Anna Welch | 49 | Housekeeper | Housekeeper | Iowa |
| 77 | Wm G. Weiber | 55 | Head | Mechanic | Illinois |
| 78 | Rose Weiber | 52 | Wife | — | Illinois |
| 79 | Lorraine Weiber | 22 | Daughter | Maid | Iowa |
| 80 | Duane Weiber | 11 | 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)