1930 United States Federal Census

Validator (claude-sonnet-5-5, 2026-10-28): consistent, confidence 1/4, tier record.
The page shows only one plausible Mary: line 77, age 27, born Bohemia, wife of James Hejnarl. That fits a birth around 1903, but the surname is not Konecny. The record cannot confirm the claimed name unless other evidence links Mary Konecny to the Hejnarl household, for example as a maiden name or a later marriage.
Matches: Page is Milwaukee, Wisconsin, ED 40-121, sheet 4B, matching the citation detail; Line 77 is Mary, wife of the head, age 27 (implied birth about 1903), born Bohemia-Austria, immigrated 1914, which fits a Czech-born Mary of 1903; Husband and children on the page (Bohemian-born household, language Bohemian) fit a Czech family
Flags: No Konecny/Konečný surname appears anywhere on this page; the candidate Mary is listed in the household of James Hejnarl (the surname is hard to read, perhaps Hejnar or Heynarl); The citation does not say which line is meant, so the identification of Mary is an inference
Limits: A census records the married name in use in 1930, so it cannot show a maiden name or a later surname; It would only support the name Mary Konecny if she is the same woman who later or earlier bore that surname, which this page does not show; The 1989 death date cannot be checked from a 1930 census; Handwriting in the surname column is hard to read