Family-friendly Mill Valley is a large neighborhood in the northern part of Marysville. The neighborhood is home to Mill Valley Elementary, Northwood Elementary and Creekview Intermediate School. Mill Valley is also adjacent to Marysville High School, with easy access to both Route 31 and U.S. 33 and 36. Walking trails, parks and playgrounds can be found around every corner in the charming neighborhood. Nextdoor.com estimates the current population of Mill Valley is 4,735 residents.