Colonel Zadok Magruder (1729–1811) was a farmer and American Revolutionary War patriot.
Magruder was a dedicated worker in the resistance against the British government, as were many in the Magruder family. Most were farmers, merchants and mechanics who had promised their fortunes in the quest for independence and for the cause of liberty.
Zadok Magruder was born in Prince George's County, Maryland, in 1729. The Magruder family was originally from Scotland. Zadok Magruder and his brother Nathan Magruder were the third generation of Magruders who were born in the Thirteen Colonies. Zadok and Nathan Magruder were the sons of John and Susanna Magruder, and the grandsons of Samuel and Sarah Magruder. Zadok Marguder's great-grandfather, Alexander Magruder, was deported from Perthshire, Scotland, in 1652, where he was an indentured servant pursuing the Scottish Rebellion. Alexander Magruder arrived in Prince George's County in 1652.
As a young man, Zadok Magruder moved to Montgomery County, Maryland.
In 1745, Zadok Magruder inherited six hundred acres of land near Norbeck from his father, John Magruder. Zadok Magruder built a house five years later in 1750 in Redland, a community which had a population of about fifty at the time. Four years later in 1754, he married Rachel Pottinger Bowie and they had eleven children, eight girls and three boys, one of whom, named Zadok, later became a doctor. Magruder later lived in an area known as Mount Pleasant, where there were many large family farms. This area belonged to Magruder and he is said to have built a house, named Mount Pleasant, in that spot in about 1807. After Magruder died, the region belonged to his son and heir, Robert Pottinger Magruder.