partner-contact/base_location/views/res_city_zip_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>

    <record model="ir.ui.view" id="city_zip_form">
        <field name="name">res.city.zip.form</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <form string="Zip">
                <group>
                    <field name="name"/>
                    <field name="city_id"/>
                </group>
            </form>
        </field>
    </record>

    <record model="ir.ui.view" id="city_zip_tree">
        <field name="name">res.city.zip.tree</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <tree string="Zips" editable="top">
                <field name="name"/>
                <field name="city_id"/>
            </tree>
        </field>
    </record>

    <record id="view_city_zip_filter" model="ir.ui.view">
        <field name="name">res.city.zip.select</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <search string="Search zip">
                <field name="name"/>
                <field name="city_id"/>
            </search>
        </field>
    </record>

    <record id="action_zip_tree" model="ir.actions.act_window">
        <field name="name">Locations</field>
        <field name="res_model">res.city.zip</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field ref="city_zip_tree" name="view_id"/>
        <field name="search_view_id" ref="view_city_zip_filter"/>
    </record>

    <menuitem
        name="Zips"
        id="locations_menu_zips"
        parent="contacts.menu_localisation"
        action="action_zip_tree"
        sequence="5"
        />

</odoo>