for the example above like this...
$user = "xxx";
$pass = "xxx";
$db = "xxx";
$link = mysql_connect( "host", $user, $pass );
mysql_select_db( $db, $link ) or die ( "Couldn't open $db: ".mysql_error() );
$query = "INSERT INTO nanny_registration (
date_registered,
date_expire,
first_name,
last_name,
previous_name,
title,
dob,
street_address,
city,
state,
zip_code,
primary_phone,
secondary_phone,
email,
hashed_password,
preferred_method,
employment_type,
hourly_wages,
weekly_wages,
two_years_childcare_experience,
avmonth,
avday,
avyear,
cities_towns,
drivers_license,
own_transportation,
household_duties,
ability_perform_duties,
limitations,
sun_availability,
mon_availability,
tues_availability,
wed_availability,
thurs_availability,
fri_availability,
sat_availability,
exp1_st_mo,
exp1_end_mo,
exp1_st_yr,
exp1_end_yr,
exp1_description,
exp2_st_mo,
exp2_end_mo,
exp2_st_yr,
exp2_end_yr,
exp2_description,
exp3_st_mo,
exp3_end_mo,
exp3_st_yr,
exp3_end_yr,
exp3_description,
exp4_st_mo,
exp4_end_mo,
exp4_st_yr,
exp4_end_yr,
exp4_description,
ref1_name,
ref1_city,
ref1_state,
ref1_phone,
ref1_email,
ref2_name,
ref2_city,
ref2_state,
ref2_phone,
ref2_email,
ref3_name,
ref3_city,
ref3_state,
ref3_phone,
ref3_email,
ref4_name,
ref4_city,
ref4_state,
ref4_phone,
ref4_email,
willing_cpr,
have_children,
ages,
special_needs_exp,
special_needs_details,
infant_care_exp,
child_care_style,
why_nanny,
discipline,
comfort,
own_childhood,
personal_description,
convicted_crime,
participate_drug_test,
additional_check,
smoker,
smoker_refrain,
accept_terms,
how_did_you_hear_about_us
) VALUES (
'{$date_registered}',
'{$date_expire}',
'{$first_name}',
'{$last_name}',
'{$previous_name}',
'{$title}',
'{$dob}',
'{$street_address}',
'{$city}',
'{$state}',
'{$zip_code}',
'{$primary_phone}',
'{$secondary_phone}',
'{$email}',
'{$hashed_password}',
'{$preferred_method}',
'{$employment_type}',
'{$hourly_wages}',
'{$weekly_wages}',
'{$two_years_childcare_experience}',
'{$avmonth}',
'{$avday}',
'{$avyear}',
'{$cities_towns}',
'{$drivers_license}',
'{$own_transportation}',
'{$household_duties}',
'{$ability_perform_duties}',
'{$limitations}',
'{$sun_availability}',
'{$mon_availability}',
'{$tues_availability}',
'{$wed_availability}',
'{$thurs_availability}',
'{$fri_availability}',
'{$sat_availability}',
'{$exp1_st_mo}',
'{$exp1_end_mo}',
'{$exp1_st_yr}',
'{$exp1_end_yr}',
'{$exp1_description}',
'{$exp2_st_mo}',
'{$exp2_end_mo}',
'{$exp2_st_yr}',
'{$exp2_end_yr}',
'{$exp2_description}',
'{$exp3_st_mo}',
'{$exp3_end_mo}',
'{$exp3_st_yr}',
'{$exp3_end_yr}',
'{$exp3_description}',
'{$exp4_st_mo}',
'{$exp4_end_mo}',
'{$exp4_st_yr}',
'{$exp4_end_yr}',
'{$exp4_description}',
'{$ref1_name}',
'{$ref1_city}',
'{$ref1_state}',
'{$ref1_phone}',
'{$ref1_email}',
'{$ref2_name}',
'{$ref2_city}',
'{$ref2_state}',
'{$ref2_phone}',
'{$ref2_email}',
'{$ref3_name}',
'{$ref3_city}',
'{$ref3_state}',
'{$ref3_phone}',
'{$ref3_email}',
'{$ref4_name}',
'{$ref4_city}',
'{$ref4_state}',
'{$ref4_phone}',
'{$ref4_email}',
'{$willing_cpr}',
'{$have_children}',
'{$ages}',
'{$special_needs_exp}',
'{$special_needs_details}',
'{$infant_care_exp}',
'{$child_care_style}',
'{$why_nanny}',
'{$discipline}',
'{$comfort}',
'{$own_childhood}',
'{$personal_description}',
'{$convicted_crime}',
'{$participate_drug_test}',
'{$additional_check}',
'{$smoker}',
'{$smoker_refrain}',
'{$accept_terms}',
'{$how_did_you_hear_about_us}')";
mysql_query( $query, $link) or die( mysql_error() );
$query2 = "INSERT INTO nanny_areas (nanny_ID, workable_area_ID) VALUES (1,2)";
mysql_query( $query2, $link) or die( mysql_error() );
if you are getting the data from a form use...
. $_GET['zip_code'] . instead of {$zip_code}