[WooCommerce 3.0+] Change the default state and country on the checkout

wc-dcc-php

add_filter( 'default_checkout_billing_country', 'change_default_checkout_country' );
add_filter( 'default_checkout_billing_state', 'change_default_checkout_state' );

function change_default_checkout_country() {
  return 'XX'; // country code
}

function change_default_checkout_state() {
  return 'XX'; // state code
}

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How do I implement this? I tried to place it in functions.php and it does not work.

So replace XX with the country code and the same with XX to the state code, with the defaults you want.
https://calebburks.com/correctly-add-custom-code-woocommerce/

This seems to only change the Country/State default for Billing Details. If Ship to a different address? is selected - the Country/State in Shipping address is not updated to reflect the defaults listed in Billing.

Extra line of code to set default for Shipping address also?
Similar question for the Cart Shipping Calculator?

Code added:
/**

• Changes default country on checkout.
  */
  add_filter( 'default_checkout_billing_country', 'change_default_checkout_country' );

  function change_default_checkout_country() {
  return 'US'; // country code
  }

This also does not update the default country used when estimating the cost to ship on the cart page. How can that be set to a default country?

There is issue with the above code. If the user has saved billing country in his/her account, in checkout the billing country will be resetted to the country mentioned in the above filter i.e. the default country rather than user's saved billing country.

Add a condition to the function, to check if the user already exists, like so:

function change_default_checkout_country( $country ) {
    // If the user already exists, don't override country
    if ( WC()->customer->get_is_paying_customer() ) {
        return $country;
    }

    return 'country_code'; // override to default country
}

Cheers!

any update for 'SHIP TO A DIFFERENT ADDRESS?' default country set?