Re: Ancestors for David March
According to what I found in the census David was born ca 1822 rather than 1834. Margaret was born ca 1832. Their children also included a Joseph H. born ca 1877, Lydia A. born ca 1865, and Emanda J. born ca 1859. The family lived in Warrington Twp., York County, PA from 1860 to 1880. A widowed Marget March, born Oct 1835, lived in Washington Twp., York Co. She had 9 of 10 children living.
There was another David March born ca 1821 who was married to a Christian and lived in York County. I could not find a David March (or similar spelling) in the 1850 census that would match your David.
Some of these records you can look at for free at labs.familysearch.org and Ancestry.com. For those you cannot see for free I suggest checking with your local libraries to see if they have Ancestry or Heritage Quest.
I suggest contacting the York County Heritage Center in York to see if they can help you. They may be able to find an obituary for David although they are more likely to just find a death notice. They may be able to find the same for Margaret.
If Margaret died 1900-1905 her death record should be on record at the Register of Wills office. If she died after 1905 her death certificate would on record with the PA Div. of Vital Records.
The death certificates and obituaries for at least one of Margaret's children should have her maiden name.