Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18600760_1 (ansi_code INTEGER, township VARCHAR)
### Question:
Name the ansi code fore ashtabula
### Answer:
SELECT MIN(ansi_code) FROM table_18600760_1 WHERE township = "Ashtabula"