add_filter( 'woocommerce_states', function( $states ) {
    if( isset( $states['FR'] ) && is_array( $states['FR'] ) ) {
        if( isset( $states['FR']['FR-2A'] ) ) unset( $states['FR']['FR-2A'] );
        if( isset( $states['FR']['FR-2B'] ) ) unset( $states['FR']['FR-2B'] );
    }
    return $states;
} );