Here is what OC (of a sort) gets you In Illinois

(a)  A County which has a chief executive officer elected
by the electors of the county and any municipality which has
a population of more than 25,000 are home rule units. Other
municipalities may elect by referendum to become home rule
units. [i][b]Except as limited by this Section, a home rule unit
may exercise any power and perform any function pertaining to
its government and affairs including, but not limited to, the
power to regulate for the protection of the public health,
safety, morals and welfare; to license; to tax; and to incur
debt.[/b][/i]
(b)  A home rule unit by referendum may elect not to be a
home rule unit.
(c)  If a home rule county ordinance conflicts with an
ordinance of a municipality, the municipal ordinance shall
prevail within its jurisdiction.
(d)  A home rule unit does not have the power (1) to
incur debt payable from ad valorem property tax receipts
maturing more than 40 years from the time it is incurred or
(2) to define and provide for the punishment of a felony.
(e)  A home rule unit shall have only the power that the
General Assembly may provide by law (1) to punish by
imprisonment for more than six months or (2) to license for
revenue or impose taxes upon or measured by income or
earnings or upon occupations.
(f)  A home rule unit shall have the power subject to
approval by referendum to adopt, alter or repeal a form of
government provided by law, except that the form of
government of Cook County shall be subject to the provisions
of Section 3 of this Article. A home rule municipality shall
have the power to provide for its officers, their manner of
selection and terms of office only as approved by referendum
or as otherwise authorized by law. A home rule county shall
have the power to provide for its officers, their manner of
selection and terms of office in the manner set forth in
Section 4 of this Article.
(g)  The General Assembly by a law approved by the vote
of three-fifths of the members elected to each house may deny
or limit the power to tax and any other power or function of
a home rule unit not exercised or performed by the State
other than a power or function specified in subsection (l) of
this section.
(h)  The General Assembly may provide specifically by law
for the exclusive exercise by the State of any power or
function of a home rule unit other than a taxing power or a
power or function specified in subsection (l) of this
Section.
(i)  Home rule units may exercise and perform
concurrently with the State any power or function of a home
rule unit to the extent that the General Assembly by law does
not specifically limit the concurrent exercise or
specifically declare the State's exercise to be exclusive.
(j)  The General Assembly may limit by law the amount of
debt which home rule counties may incur and may limit by law
approved by three-fifths of the members elected to each house
the amount of debt, other than debt payable from ad valorem
property tax receipts, which home rule municipalities may
incur.
(k)  The General Assembly may limit by law the amount and
require referendum approval of debt to be incurred by home
rule municipalities, payable from ad valorem property tax
receipts, only in excess of the following percentages of the
assessed value of its taxable property: (1) if its population
is 500,000 or more, an aggregate of three percent; (2) if its
population is more than 25,000 and less than 500,000, an
aggregate of one percent; and (3) if its population is 25,000
or less, an aggregate of one-half percent. Indebtedness which
is outstanding on the effective date of this Constitution or
which is thereafter approved by referendum or assumed from
another unit of local government shall not be included in the
foregoing percentage amounts.
(l)  The General Assembly may not deny or limit the power
of home rule units (1) to make local improvements by special
assessment and to exercise this power jointly with other
counties and municipalities, and other classes of units of
local government having that power on the effective date of
this Constitution unless that power is subsequently denied by
law to any such other units of local government or (2) to
levy or impose additional taxes upon areas within their
boundaries in the manner provided by law for the provision of
special services to those areas and for the payment of debt
incurred in order to provide those special services.
(m)  Powers and functions of home rule units shall be
construed liberally.