### Database Schema:
CREATE TABLE country (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	county	TEXT	NULL	PRIMARY KEY,
	state	TEXT	NULL,
	foreign key (state) references state (abbreviation),
	foreign key (zip_code) references zip_data (zip_code)
);

CREATE TABLE alias (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	alias	TEXT	NULL,
	foreign key (zip_code) references zip_data (zip_code)
);

CREATE TABLE state (
	abbreviation	TEXT	NULL	PRIMARY KEY,
	name	TEXT	NULL
);

CREATE TABLE area_code (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	area_code	INTEGER	NULL	PRIMARY KEY,
	foreign key (zip_code) references zip_data (zip_code)
);

CREATE TABLE congress (
	cognress_rep_id	TEXT	NULL	PRIMARY KEY,
	first_name	TEXT	NULL,
	last_name	TEXT	NULL,
	CID	TEXT	NULL,
	party	TEXT	NULL,
	state	TEXT	NULL,
	abbreviation	TEXT	NULL,
	House	TEXT	NULL,
	District	INTEGER	NULL,
	land_area	REAL	NULL,
	foreign key (abbreviation) references state (abbreviation)
);

CREATE TABLE CBSA (
	CBSA	INTEGER	NULL	PRIMARY KEY,
	CBSA_name	TEXT	NULL,
	CBSA_type	TEXT	NULL
);

CREATE TABLE zip_congress (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	district	TEXT	NULL	PRIMARY KEY,
	foreign key (district) references congress (cognress_rep_id),
	foreign key (zip_code) references zip_data (zip_code)
);

CREATE TABLE avoid (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	bad_alias	TEXT	NULL	PRIMARY KEY,
	foreign key (zip_code) references zip_data (zip_code)
);

CREATE TABLE zip_data (
	zip_code	INTEGER	NULL	PRIMARY KEY,
	city	TEXT	NULL,
	state	TEXT	NULL,
	multi_county	TEXT	NULL,
	type	TEXT	NULL,
	organization	TEXT	NULL,
	time_zone	TEXT	NULL,
	daylight_savings	TEXT	NULL,
	latitude	REAL	NULL,
	longitude	REAL	NULL,
	elevation	INTEGER	NULL,
	state_fips	INTEGER	NULL,
	county_fips	INTEGER	NULL,
	region	TEXT	NULL,
	division	TEXT	NULL,
	population_2020	INTEGER	NULL,
	population_2010	INTEGER	NULL,
	households	INTEGER	NULL,
	avg_house_value	INTEGER	NULL,
	avg_income_per_household	INTEGER	NULL,
	persons_per_household	REAL	NULL,
	white_population	INTEGER	NULL,
	black_population	INTEGER	NULL,
	hispanic_population	INTEGER	NULL,
	asian_population	INTEGER	NULL,
	american_indian_population	INTEGER	NULL,
	hawaiian_population	INTEGER	NULL,
	other_population	INTEGER	NULL,
	male_population	INTEGER	NULL,
	female_population	INTEGER	NULL,
	median_age	REAL	NULL,
	male_median_age	REAL	NULL,
	female_median_age	REAL	NULL,
	residential_mailboxes	INTEGER	NULL,
	business_mailboxes	INTEGER	NULL,
	total_delivery_receptacles	INTEGER	NULL,
	businesses	INTEGER	NULL,
	`1st_quarter_payroll`	INTEGER	NULL,
	annual_payroll	INTEGER	NULL,
	employees	INTEGER	NULL,
	water_area	REAL	NULL,
	land_area	REAL	NULL,
	single_family_delivery_units	INTEGER	NULL,
	multi_family_delivery_units	INTEGER	NULL,
	total_beneficiaries	INTEGER	NULL,
	retired_workers	INTEGER	NULL,
	disabled_workers	INTEGER	NULL,
	parents_and_widowed	INTEGER	NULL,
	spouses	INTEGER	NULL,
	children	INTEGER	NULL,
	over_65	INTEGER	NULL,
	monthly_benefits_all	INTEGER	NULL,
	monthly_benefits_retired_workers	INTEGER	NULL,
	monthly_benefits_widowed	INTEGER	NULL,
	CBSA	INTEGER	NULL,
	foreign key (state) references state (abbreviation),
	foreign key (CBSA) references CBSA (CBSA)
);

### User's Query:
Name the country with the largest number of households in a residential area.

### Extra Knowledge:
the largest number of households refers to MAX(households);
SELECT T1.county FROM country AS T1 INNER JOIN zip_data AS T2 ON T1.zip_code = T2.zip_code GROUP BY T1.county ORDER BY T2.households DESC LIMIT 1