Located 1/2 mile East of Platteville on Weld County Road 32 in Township 3, Range 66, Section 18. The Platteville Mizpah Cemetery is the oldest public cemetery in Weld County that is still in use. It is operated by the Town of Platteville. Originally called the Sandhill Cemetery by the pioneers, it was renamed Mizpah Cemetery after 1926. In 1926, the Mizpah Club made the improvement of the cemetery their club project. With the club as a driving force, cemetery improvement became a community project. Trees, shrubs, and grass were planted as money became available. A WPA project in 1939 fenced the cemetery and installed the first rock gateway. The second rock gateway was built and dedicated to the memory of the area servicemen who lost their lives in World War II.
An unknown person is the first recorded burial, the first named burial was in 1873. Persons associated with the nearby fur trading posts and Fort Vasquez may have been buried on the hill as early as the 1840s. A local folklore heroine named Rattlesnake Kate is buried in Mizpah Cemetery. One day in 1925, she killed 140 rattlesnakes on her way to a pond with her son. The snakes were collected and the skins were used to make a dress, which she wore to many functions. Her story is on file with the Platteville Pioneer Museum.

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Name	Row	Lot	Space	Notes
O'Bannon, Geneva I		7N	6
O'Bannon, John F		7N	5
O'Conner, Mrs.	6	48	7
O'Daniels, Alfred Lee		18	12
O'Neil, Rose M		121	4
O'Neill, Christopher	17	188	5
O'Neill, Grace E		188	4
O'Neill, Thomas Wm	17	188	5
Odell, Owen Dow		1N	8
Odenbaugh, Christina		202	3
Odenbaugh, Connie L		202	10
Odenbaugh, Gene Larry	18	202	7
Odenbaugh, Irene		254	4
Odenbaugh, Norman Leon	18	202	9
Odenbaugh, Pat Peter	18	202	8
Odenbaugh, Paul		254	3
Odenbaugh, Peter		202	6
Odenbaugh, Peter G		202	4
Odenbaugh, Stanley		73	10
Odenbaugh, Walz Rosa	18	202	2
Olin, Christy Lee	16	179	10	8/1/1963 – 12/24/1964
Olin, James		214	5
Olin, Jeanette Marie	19	214	6
Olin, Ray E		214	12
Olivas, Alvina		218	11
Olson, Christiana	12	130	4
Olson, John H	12	130	2
Olson, Nels R	12	130	1
Olson, Olga	12	130	6
Olson, Olof	12	130	3
Ornate, Ysidro	20	224
Ortiz, Victoria P	20	227	11
Ottesen, Christian Jeppe	7	57	3
Ottesen, Lena	7	57	4
Ottesen, Louella	7	57	3
Ottesen, Nels	7	57	5
Owens, Helen Hyatt		149	12
Owenson, John	4	18