How many shipments were shipped to the least populated city in California?
"California" is the state; least populated city refers to Min(population)
SELECT COUNT(T3.city_name) FROM customer AS T1 INNER JOIN shipment AS T2 ON T1.cust_id = T2.cust_id INNER JOIN city AS T3 ON T3.city_id = T2.city_id WHERE T3.state = 'California' ORDER BY T3.population ASC LIMIT 1