The 30-year, fixed-rate mortgage remained flat from last week ending at a 4.14% national average the week of Oct. 20-26, according to the Zillow Mortgage Marketplace weekly update. Zillow said the average current 15-year, fixed rate is 3.6% and the rate for a 5-1 adjustable rate mortgage is 3.01%. That type of mortgage maintains a steady rate for five years and then is adjusted annually thereafter. Regionally, 30-year rates vary, as the West Coast experienced rate deprecation and the East Coast witnessed rate appreciation. California’s average rate fell to 4.12% last week, down from 4.18% while rates in Colorado fell to 4.13% from 4.27% the previous week. Washington saw its average rate drop to 4.14% from 4.18%. Massachusetts’ average rate for a 30-year fixed rate climbed to 4.24% from 4.14% during the Oct. 13-19 period, as did New Jersey’s, up to 4.14% from 4.06%. Pennsylvania’s current rate of 4.11% is down from 4.21% last week. Zillow bases its averages on real-time mortgage quotes from lenders registered with the company. The national average comes from thousands of daily quotes by anonymous borrowers through the Seattle-based company’s website. Write to Christine Ricciardi.