It's a small village of Tohono O'odham Nation. It's located 6.8 miles southeast of San Miguel. Below is a google earth map of Newfield. Baboquivari Mountains are some 4.0 miles east of Newfield. Using google earth i counted around 12 housing units. Population of Newfield is probably between 15 and 30. It depends on how many housing units are lived in. Sonoran desert conditions around Newfield are lush compared to Papago Reservations west side.
Google Earth Map of Newfield