1900 Fed Census misspelled family name HAYWARD - On close inspection of original document, it's pretty clear the spelling is HEYWARD and that conforms to existing birth date determined from daughter's wedding registration to Geo. W. Rhinehart.

Listed in 1900 Fed. Census:
Head Wm Hayward M 37 Illinois (about 1863)
Wife Mary Hayward F 30 California (about 1870)
Son Archard Hayward M 11 California (about 1889)
Son William Hayward M 8 California (about 1892)
Daughter Hatty Hayward F 6 California (about 1894)
Daughter Ida Hayward F 4 California