Again, we can use a URL variable to collect a string, and use the string supplied for a query filter. If Wash is used as the URL variable county_name, the query will find all counties with names that start with Wash:

@app.route('/nba/api/v0.1/county/<county_name>', methods=['GET'])
def get_county_name(county_name):
  counties = session.query(County).filter(County.name.like(county_name+"%")).all()
  data = [{"type": "Feature", 
  "properties":{"name":county.name, "state":county.state.name}, 
  "geometry":{"type":"MultiPolygon", 
  "coordinates":[shapely.geometry.geo.mapping(to_shape(county.geom))["coordinates"]]},
  } for county in counties]
  return jsonify({"type": "FeatureCollection","features":data})

The filter method can be used on spatial fields as well as non-spatial fields.